I mean this question honestly: are you American? Because back in the States, mentioning that I'm a socialist would bring the reply, "So why are you working in private industry instead of for the government? Are you here to infiltrate our business?", and things of that nature. At that point I'm not explaining anything, I'm in a debate over whether left-wingers are violating our own principles by ever working in a private, capitalist business (the proper answer is, of course we are, but nobody living under capitalism can actually boycott all capitalist enterprises and remain alive day-to-day). At that point, I've failed the interview by dragging myself off-topic and into an argument.
Point is, yes, outside the US, and to a lesser extent the rest of the Anglosphere, approximately half the world has some kind of left-wing views. Probably as many people have a hobby someone might embarrass them about. It's just not very common in polite company, in most cultures (where I live now it's downright common), to bring up this kind of out-of-work stuff as part of a job interview.
As to the anime, I once mentioned in a daily SCRUM meeting that I wanted to get done a meeting with my team leader before 5:30 because I wanted to get to an anime club at 6PM. A senior colleague, who I really do like and admire most of the time, said that Rule 1 of Anime Club is never to talk about Anime Club. This man was a professional software engineer, working in a software company, who had himself sold bootlegged imported anime back in the '90s as a side gig, and here he was engaging in geek-shaming.
That was one of the many things which made me feel deeply, deeply uncomfortable in that workplace, the other one being the fact that many people there openly and enthusiastically brought up their right-wing libertarian views (without my prompting, this was between other person 1 and other person 2) during work hours.
Overall, the various little details I hadn't detected at the interview eventually added up to a gestalt feeling that the place had the company culture of a particularly right-wing frat-house. I didn't last long there before leaving... on good terms with everyone, but feeling uncomfortable and ashamed nonetheless of leaving a job too early-in.
Hmm.... which means that for small companies like that one, you've actually got a very good point. If I bring up something controversial or unusual and the interviewer can't accept that I have views and hobbies outside work which he/she deliberately asked to hear about (provided I don't go into some boring technical lecture on an obscure topic in Computer Science I like or a physics discovery I don't actually understand nearly as well as I think I do), then it's almost definitely not a good match of a place to work for me. The model just breaks down when we're talking about large companies, or places that have a lot of good going for them outside their company culture.