The best thing you can do is not call for some overarching policy banning whatever annoys you (politics, culture war, lame memes) but simply downvote, make cons

The best thing you can do is not call for some overarching policy banning whatever annoys you (politics, culture war, lame memes) but simply downvote, make constructive comments about how this is a waste of time, or just ignore those submissions. This sort of thing tends to ebb and flow with election cycles, especially for U.S. based commenters. It's going to get more annoying as the next year goes on, but for whatever reason people feel the need to share their opinions on this more during important elections (whether the majority of people consider it worth reading or not). IMO, silent tolerance (up to a point) is more discouraging than engaging with the nonsense as it gives them nothing to push back against. I'm also reminded of this post of an IRC chat room where (apparently) one person is arguing with themselves in an otherwise empty room about some kind of political point. While you may want to believe you are engaging with a worthwhile opponent, you could be talking to that person, and you just don't know it.