I don't remember specific subreddits but it was mainly left leaning subreddits banning anyone who had ever commented on e.g. r/theDonald, even if they'd gone there to debate in good faith (lol)
You'd likely never know you had been banned from a chunk of subreddits since it was shadowbans
Bro they literally just want people to be nice, how on earth is that concept making you so angry?