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When they find out, everyone else is confused, Thor and Loki are completely normal. Thor simply asks if he called Peter something else today, but Peter says no, and he's just like 'alr, cool.' Loki is trying to give him tips on shape shifting, thinking that maybe he just ran into a hit of a mistake, and when he learns that it wasn't shape shifting, he gags and dramatically fawns over him 'Oh you poor thing!' And then does an illusion or something.
There's definitely a confused yet supportive Steve and Bucky, just shouting 'IT'S HE NOT SHE! HE'S TRANSLUCENT' To everyone who misgenders him.
When everyone finds out, Tony is laughing in the corner because he was the only one who knew, and now he gets to watch this drama unfold. Natasha is so dumbfounded as to how she didn't find out, and Clint gives him a dad speech.
Sam completely ignores it, but asks him casually if he's supposed to call him something else, and then also corrects everyone who gets his pronouns wrong.
Bruce to immediately starts working on a testosterone that wouldn't burn through his metabolism, since it's artificial.
The first time someone calls him a slur around the team, Peter is used to it, but the Avengers aren't, so Steve and Bucky are shouting, Sam having to hold them both back, while also correcting them. Natasha and Loki are in the corner planning murder, Tony is angrily shouting at him, already calling his lawyers and threatening to sue or something, Thor is spinning his Hammer, Bruce is turning green and doing yoga in the corner, Clint is pulling a dad and angrily shouting at him while tapping his foot disapprovingly while Peter is just like 'Wtf'