i think a lot of people mistake vegans for believing themselves to be "morally superior" rather than the actual, and very reasonable stance that IF YOU HAVE THE OPTION NOT TO KILL OTHER LIVING BEINGS, YOU SHOULDN'T DO IT.
most of us can understand that it's stupid to wield "oh so you think you're morally superior" against any type of human or environmental rights activists because how do you even respond to that? sure? Because its NOT ABOUT MORAL SUPERIORITY. IT'S ABOUT NOT UNNECESARILY CAUSING HARM.
Also, an activist could be the most annoying, self righteous person on the entire planet, but their stances having NOTHING to do with that. An asshole saying "trans rights" doesn't mean you shouldn't support trans rights because an asshole said it.
PLEASE start looking at veganism like you look at any other form of activism and resistance, and consider what disinformation and propaganda you've been fed about it.