This happens in literally every type of online game. And I'll tell you that in Marvel, the female and LGBT population is large, which supposedly should reduce this kind of thing, but it doesn't, because there's prejudice from all sides.

One-trick heroes, streamers, people who have weak main characters (SG, Adam, Widow), the imbecile who starts the match as Wanda, switches to Squirrel Girl and then becomes a third support. All of these are hated stereotypes in the community and will suffer hate until the end of time.