The trouble is "keeping politics out" isn't really a thing, because politics more or less supersedes everything, ultimately.
Politics is what could cause the government to ban disc golf under penalty of death. Not likely today, sure, but if it happens, it's politics that makes it happen. Politics could much more likely get it banned from your local park.
And people are people and you cannot escape that. Sooner or later people chat off topic and someone might mention they have a baby for example. Then /u/babyeatingjim expresses his culinary preferences and suddenly no one's allowed to yell at him to fuck off because baby eating is a political issue now and telling a baby eater to go away and never come back is "political".
When politics goes sour it seeps into everything. "zealots" are pissed off that people are doing the equivalent of banning disc golf from the park because it's played by mostly people on the other side, and of course the "zealots" are also pissed off because bad politics is literally killing people.
Yes you want to shut your ears and keep out the noise, but that's unfeasible when the noise outside is too loud. The problem is not that people "let" politics get into everything, it's that the noise outside IS too loud. You can't shut it out.