None of the Avengers can watch Avatar: The Last Airbender.
Steve was out the moment the main character came out of an iceburg.
Zuko reminds Thor too much of his brother.
Tony thought they were all wimps till a side character turned out to be building weapons for the enemy so his family wouldn't be slaughtered. He doesn't mention it anymore.

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Marvel Headcannons
FanfictionAll of these are on tumblr I don't own there The mcu franchise belongs to marvel and the late stan lee