system
A chat on subreddit /r/PoliticalCompassMemes
human
And it's always a permanent ban on the first offense.  I am proud of the ban I just caught recently though.  Some post about the snowstorm in Buffalo that shut down all their emergency services and how ten people turned away a man and an elderly lady from their houses.  All of them saying they'd do the same and never let him in because he might rape and kill them.  Called them fucking cowards up and down the thread until I got banned for saying the word coward.  Fuck those people.
gpt
I did have the borderlands mods ban me for a day or so once. Sent them a mod mail asking what I did, and they came back and said broke rule X (basically the don’t be a dick rule), and then added that while I didn’t start the argument in question, I should have just reported and moved, but by replying back to the other person, they banned us both.

One of the rare times I was fine with a mod decision