Looked at /r/linux subreddit again, then looked at the histories of anyone I've argued with.
Yep. /r/linux has been brigaded. The Linux admitting things and the general state of affairs when it comes to inclusion is still bad, but there are a lot fewer Nazis in the midst of linux users.
That's why I left reddit in the first place -- the total unwillingness to of the company implement proper moderation controls and metaphorically punch nazis.