Politics is fine if it's discussed like it is on HN†: level-headed arguments are debated, discussed, and, if a consensus isn't reached, we can agree to disagree. Reddit is polluted by absolute political drivel, except for a very small subset of subs. Low-effort "Trump is bad" posts that get massively upvoted just gets old after a while, especially when you see it every single day.

† HN has been historically center-libertarian (which is a bit of self-selection by entrepreneurial folks), but recently started leaning much more left, no doubt due to an influx of non-startup-founding users.