Apart from how it's very hard to avoid, given that at least half the fediverse seems to be either Reddit-related, political, or politically Reddit-related.
(Seriously, any pointers on blocking that shit apart from playing whack-a-mole with all the different "subs" would be great, there are simply too many. Each instance can have many mags/communities for the same topic, and there's obviously quite a few instances too. I don't suppose we can filter subs with regex?)