The main reason is that they try to control what people think and how they feel. They don’t understand that just because they want to be seen and treated a certain way doesn’t mean everyone else needs to accommodate them.
If you believe men can’t be women (and vice-versa), that’s fine. If you believe they can, that’s fine too.
If you believe your view is an abject fact and there should be no discussion, then that’s not fine. Unfortunately, a lot of people fall into the last category where they hear something that challenges their beliefs and immediately want to censor it. All that does is create enemies by telling people they can’t discuss their views.
It’s an effective tactic, on both sides.
Nobody is trying to control what people think or how they feel. You’re really just being an ignorant fool in every comment you post, aren’t you?