I'm not sure that one who purposely goes into subreddits of topics one disagrees with to throw insults and start arguments is exactly a model user, in fairness.
Those were subreddits of conspiracy theorists and propaganda bots, I didn't really care all that much about their feelings. I wasn't banned for speaking out against it, I was banned because I commented at all in those subs and the moderators HATED said subs because they were anti-vax cesspools and assume anyone who would go there opposed their world views. You deserved punishment even if you had never even so much as read their "popular" forum. It was a power play and ego boost for them, maybe to make up for holes in their own lives so they could feel powerful at least somewhere.