I’m literally the most left person I personally know by a wide margin

So you don't count people you know online, you also don't go to organizing union meetings, are not part of collectives and not part of a real left party (thus are likely an individualist, moralist, idealist liberal who will often - since there is little self critique and reflection - for example having thought how you could integrate parts of being anti racist in your life within a group). Of course you might be called a reactionary in some cases. Feel free to link to them, post those opinions in the un-safe space we got here as quote and people can do reflect on that. Taking your quote (which likely ignores context to present yourself in a better light) I have to say that:

trans people should be able to do whatever the fuck they want" (good) "***********************” (bad)

Yeah that is reactionary. You were rightfully banned as you broke server rules. There were enough campaigns i.e. "Read Trans Liberation!" for you to educate yourself. You didn't. You are not the victim here.

To break it down: You went into a space of solidarity and then climbed on a chair and yelled "I don't care about [group you are supposed to be having a minimum degree of solidarity with]". Everyone is able to understand that this is even if it is your uncle's birth date and you would yell that you don't care about your uncle it is a social faux pas. However what you did is much worse.

The website's slogan at that point even was "We love our trans comrades!"

Besides:

and told to k**l m***lf and then a mod agreed with them

X: [Doubt]

You already showed yourself to be an unreliable narrator, no reason to believe such an extraordinary claim.

Edit Wonder who downvotes this post