It is hard to think of a more virtuous and honorable Marvel character than Captain America. He represents the best of what his country tries to be in its own national mythology, always striving to be better and taking a stand to help others.
Captain America is the first Avenger. It even says so right in the title of his debut MCU movie. But he is also a man out of time, and comes to the modern world with some judgmental attitudes toward those who think or act differently than he expects. Here are ten Avengers that Captain America can't stand.
10 Iron Man
It is no secret that Iron Man and Captain America have a long-standing rivalry. These two are the best of frenemies, one of them representing an often volatile vision of the future and the other drawing inspiration from the ideologies and mythology of America's past. Often, their rivalry has broken out into violence.
There is no denying that the two respect each other (Cap respects some aspect of almost every person on this list, despite their personal disagreements). The tension between these iconic Marvel heroes was central to Jonathan Hickman's legendary runs on Avengers and New Avengers, in which he described one of them as representing life and the other representing death. Is it possible to make a starker contrast between Steve Rogers and Tony Stark?
9 Spectrum
Photon. Pulsar. Captain Marvel. Monica Rambeau has had many superhero names over the years, though these days she goes by the title of Spectrum. While no longer a part of the main Avengers roster, she considers her time on the team one of the highlights of her awesome life as a superhero.
However, during the comic Nextwave, some details emerge about how she was mistreated by Steve Rogers. Apparently Captain America spoke to Rambeau like he was still representing the America of the 1940s, making demands of her that degraded her gender. He even ordered her to leave a battle to cook. Nextwave is not technically canon, so fans don't have to accept this as part of Cap's identity, but the disrespect he gave Monica is genuinely shocking.
8 Namor
Namor has plenty of different team affiliations, but he is not known as one of the Avengers. Rather, people associate him with Atlantis, the X-Men, the Invaders, and the Defenders. However, during Jonathan Hickman's run of New Avengers, Namor was one of the main characters on the team, along with all of the members of the Illuminati.
All of the members of the Illuminati except for Captain America. After Cap voiced some strong objections to some of the extreme measures his teammates were contemplating to save the Earth from extradimensional incursions, Namor and the others mindwiped him. However, Cap's troubles with Namor go all the way back to when the two were part of the Invaders during World War II, butting heads even then due to Namor's limitless arrogance.
7 Deadpool
Deadpool joined Captain America's Unity Squad, where he fought alongside Captain America as part of a superhero team comprised of humans, inhumans, and mutants. Despite this, both Deadpool's humor and his mercenary work rub Steve Rogers wrong (and, let's admit it, Deadpool probably went out of his way to rub every team member wrong in some very uncomfortable ways).
Plainly put, Steve Rogers is an all-American hero who believes in self-sacrifice to help others while Deadpool, from Cap's perspective, is a foul-mouthed humanoid cancer pustule who kills people for money. The conflict here should be abundantly obvious.
6 Rogue
Another member of the Unity Squad, Rogue and Steve Rogers butted heads quite a bit during her time on the team. Rogue had just survived a war between the X-Men and the Avengers, leaving her feeling less than cooperative when it came to working with the Avengers who had attacked her and her fellow mutants.
For his part, Steve tried to be patient (mostly) but Rogue's temper and brash behavior endangered the team and caused quite a bit of damage on the public relations front. He did his best to not show his anger, but Steve Rogers is used to leading a team and he was clearly upset that he could not control Rogue (and that she seemed to be losing control of herself).
5 Hank Pym
Hank Pym has occupied a weird place in the minds of fans (and other Marvel characters) for a long time. He is a genius who feels insecure about not being as smart as Tony Stark or Reed Richards, while he has also struggled with mental health issues, leading him to tragically hurt his lifelong love, Janet van Dyne.
Unfortunately, Steve Rogers has a very dated view on mental health. It is horrible that Hank hit Janet. It was an act of abuse. But there is a big difference between someone being a serial abuser and woman beater, and someone with mental health struggles losing control and hurting someone they love. Steve Rogers fails to make this distinction. Of course, it doesn't help that Hank built Ultron, then merged with the evil android to become a supervillain.
4 Luke Cage
For a white man born in the early 20th Century, Captain America has a remarkably progressive outlook on race. He fought in a segregated army, lived during a time lynchings were considered communal affairs, and when he was brought out of the ice in 1964, interracial marriage was still illegal in the United States. Despite being accepting of all people, that does not mean Steve Rogers understands all people.
Luke Cage is the Harlem hero and has often taken unpopular positions because he understands systemic oppression in a way other heroes don't. When Luke took over leadership of the second incarnation of the New Avengers team, Cap gave Luke Cage his blessing, but also put pressure on Luke to accept members like Victoria Hand, undermining Luke's independence. This suggests that Steve does not respect or trust Luke to be a leader.
3 Jessica Jones
This is a weird scenario, because Steve Rogers demonstrates his respect for Jessica Jones at the very start of her original series, Alias, after she works to keep his secret identity hidden. Then he gets to know her a bit better.
Jessica Jones is a foul-mouthed, independent-minded cynic. She is also a mean drunk and a wildcard. These qualities do not exactly endear her to Captain America, to say the least. He is rarely ever blatantly rude to her, but he definitely has issues with her attitude.
2 Swordsman
Swordsman is not so much a superhero as an arrogant braggart who cons his way onto the Avengers. He has a unique origin, being the son of a French colonizer in a Southeast Asian country who joined with the communist rebellion the native people launched against their foreign European oppressors.
His anti-colonialist and communist sympathies might very well put him into conflict with Captain America, whose version of democratic values is intrinsically linked to free-market capitalism. However, the real reason he and Cap clash is that Swordsman is a thief, conman, and just all around smarmy guy. Ideology has no part in their disagreements.
1 Moon Knight
Moon Knight gets his powers from the Egyptian deity Khonshu, a god of the moon, and of vengeance. With a moral code informed by ancient Egyptian values, Moon Knight does not care about saving the weak, but rather works to protect those who travel by night. He also takes the vengeance purview to extremes, once even cutting the face off of an enemy.
Captain America generally does not believe in torture. He also has a very different value set. While the two work together on a number of sensitive missions, Steve does not respect Moon Knight's mode of operations.