'Attacked' is a bit subjective, but there are certainly trigger topics that attract large numbers of strongly right-leaning posters. I won't list these topics as they are basically exactly the 'culture wars' topics that you'd expect.

I do personally find HN quite uncomfortable when discussion strays into social issues. I obviously don't feel that unwelcome here as I've been here since 2009. But there is a lot of bottled-up hostility to certain groups of people that can be released when the discussion takes a certain turn. And my subjective perception is that this has got much worse over the past decade.

Extremist comments usually get flagged eventually, but lots of people have already read them by the time that happens, and you can post outrageous things here without actually getting your account banned. It's galling to be a member of group X, see an unambiguously hateful comment about group X, and then see this same account continuing to post for years afterwards.