I've been vegetarian and had spells of veganism for 45 years. I've actually found myself turned off veganism in recent years for several reasons.
I see a number of young women around me who use veganism as a way of maintaining a low body weight. I can think of two in particular for whom healthy eating and veganism have supported anorexia. I think it's a complicated subject, but in some cases veganism can be a way of being thin and observing society's expectations of how women can look. And of course some people are naturally slim without dieting and without being anorexic, and some vegans aren't slim, and that is all absolutely fine.
I went to a vegan food festival with talks a few years ago and had to leave early because it revealed a kind of fascism — including suggestions that people who ate meat deserved to be killed — that reminded me very strongly of TERF rhetoric. Most of the speakers were male and there was the kind of 'if you're not totally with us you're against us' emphasis that scared me.
I also agree with whoever said that some of the worst attributes of veganism match those of genderism. For some people it's about being green, trying not to cause unavoidable harm and suffering in the world. For others it's about rebelling, being special, being better, getting attention. That's why it's hand-in-hand with genderism.
And again, NAVALT.