I mean I just never ended up subscribing to political communities, so I never see any political related things anyway. If you only subscribe to meme and lighthearted communities, you're not likely to run into that stuff. Your comparison of it being a "Nazi bar" doesn't work. I've never been someone who browsed the "all" category of Reddit, and I've not been inclined to do that here on Lemmy, either. So no, you often won't see that sort of thing unless you're browsing by all communities.