This seems like a big overreaction to me, so I see it as a clear PTB. I dislike the idea of banning people based on history in other communities, other than to check if they are a bot or advertiser or something obviously malicious. Trolling could mean something as simple as being sarcastic, and glancing through OP’s history they seem to be a real person who believes what they say, even if they can be quite rude about it.

But the upvote/downvote split suggests the community is more divided on this.