I'm a real petty person so I'm sure I could come up with a whole laundry list if I thought hard enough

This is a super specific scenario but it happens often enough and is irrationally frustrating enough that I remember it. When I'm sitting alone on the train in a row of seats behind another row where the seats have been flipped around to make two rows that face each other, and someone sits in the row facing me and flips the seat in between us around so that they're then sitting in a single row and I'm now in the group of seats facing each other. It's such a minor thing, but it pisses me off so disproportionately that whenever it happens I'm forced to think about whether I'm the one that's got an attitude problem. After years of soul-searching, I've figured out that
they're the problem, not me.
Clearly I'm a very antisocial person. But so is everybody else on that train except the one creep that tries to start a conversation when I've got my earbuds in. And crucially, so is the seat-flipper, because they wouldn't flip the seat unless the idea of smashing knees with somebody sitting across from them and having slightly higher odds of actually having to interact with another human being is as unappealing to them as it is to me. That's fair enough - what makes these people assholes is the fact that they'll be antisocial with no consideration of whether other people are as antisocial as them. Worse still, it makes me an even bigger asshole if I do anything about it. Do I flip the seat back and assert myself? Obviously not; if I was that confrontational I wouldn't even have this dilemma. Do I passive-aggressively glare disapprovingly at the person sitting across from me? Maybe, it depends if there are free seats nearby and if they look like they'd acknowledge me. Am I a little bitch that cares way too much about this? Definitely.
It's a dog-eat-dog world. I guess at the end of the day, the seat-flippers are just looking out for themselves. But if it were up to me, I'd think hard about scrapping the utility of flippable seats and making every train like those ones with the fuzzy seats and shit curved windows that are somehow always too fogged to see out of, just so I can avoid the dreaded dilemma.