I'm surprised you've had an apolitical experience up until two weeks ago. HN has always had politics creep onto the front page, less so during the off-season, but still pretty present IME. Especially prevalent over the last two years. Lots of side conversation bickering in random threads.
It's definitely been increasing compared to what it used to be, but this may also be natural consequence of the fact that big tech itself has become much more "political". It didn't use to be the case that the owners and managers of technology corporations displayed their political preferences quite so brazenly (in the case of Elon Musk, even to the point of taking on a leading government position).
Of course, corporations have always had policy preferences, but those tended to be mostly about taxation and regulation, where debate is less emotionally charged, and compromise is more achievable. These days, though, it seems that tech and political culture have become almost inextricably linked.
I guess I just expect a high baseline from...everything else. It's hard to avoid these days.