Does Hexbear mandate all users to specify their preferred pronouns?

I just checked and those rules are wild.

Posting a picture of a slice of cheese without a NSFW tag and a content warning is bannable but calling violence against large groups of people isn't.

I believe they do, yes. It's done to out anti-trans people, making them easy to spot as they complain loudly about being forced to.

In their general rules:

Any pictures of food containing animal products, including but not limited to meat, cheese, or egg, must be tagged nsfw along with food discussion content warnings (CW: Food).

Animal Liberation is essential to any leftist movement, including platforms like Hexbear. Volunteers, comments, and posts, should not be anti-vegan, although users and volunteers are not required to be vegan.

Wow. Just wow. That is so far beyond leftist.

It's part of the signing up process. I've seen people without them, but it's very rare. There's probably a grace period.

Yes

They're a satire of failed marxist extremists that hate everyone and everything. Just block them and move on.