That's the tricky thing with biases, right? They're formed by our experiences

And also by believing unreliable sources like Melissa May and not questioning loaded terms coined to inspire and reinforce biases. Such as "illegal alien" and "carnist".

My experience interacting with vegans has clearly been different from yours

Probably because you are one yourself and thus aren't the target of their slurs and other bigotry towards people who don't follow their extremist version of vegetarism.

that may explain why you would think I'm denying reality.

The fact that you blatantly are is another big motivator as well.