Lack of imagination. Oh you can't IMAGINE people thinking/feeling/doing a certain way? Oh really? It doesn't even click in as a possibility? You can't consider that people live different lives, coming from different formative experiences? You can't even PROCESS it? Well I can imagine people like you, I just don't like them.
Classism. I'm basically poor as hell, but I mean it in all directions. No you poors, the rich are more oblivious than malevolent against you specifically, they just have inbred selfishness. No you elites, if you don't consistently do something about inequality, it inevitably ends with your life, unless we believe we're at the end of history. If I see someone whine about losing access to their housekeeper, I probably dislike them (a reason why I can tolerate my partner's relative is because he used that as a chance to just boast about his robot carpet cleaner instead). If I see someone whine that there's LITERALLY ZERO jobs and NO way to feed themselves in CANADA (and not in a remote area of it), I immediately think they're dumb or simply manipulative. Same goes with treatment to service workers. Treat them with disdain, I think of you with disdain. Treat them as though you're one and the same so you deserve special treatment, I think you're going to be a pain in my ass.
I actually don't mind people who only talk about themselves, with the caveat that they seem to deliberately leave room for you to interject and talk about yourselves with no undue judgement. But this is just reflecting off myself who is either largely quiet and liking to hear others, but occasionally gets carried away with a topic and hopes that I didn't dominate the talk too much. I guess I want more leeway to I give more leeway.
Social conservatism. I'm more tolerant than many of my friends towards socially conservative notions people can have, but as identities I'm even less forgiving. Same with related concepts like religiosity, where I get if someone needs to bring up a religious concept and belief that connects with a religious philosophy, its more fine with me than most atheists, but I abhor religions as institutions and their most mindlessly fervent believers.
Humblebragging or even flatly bragging, without a hint of sarcasm about it mattering. You can be a genius coder, just give me the wink that understands that for all we know, it could be a dead profession in decades. You could explore the world, just give me the wink that you know that it'll matter as little as anything else after you're gone. You can volunteer thousands of hours, just give me the wink that communicates that you know structural change requires more than personal 'sacrifice'. You can have several successful children, just wink in knowledge that at least one will most likely fuck up beyond belief and that you won't condemn them for being less than perfect. If you're just showing off, you're weirdly almost not a person to me. I can IMAGINE (see above) you as a person, but its kind of wispy and false.
While our relationship isn't the dreamiest ideal or anything, in many ways I'm describing what I find appealing in my partner. He's with a strict good/bad black/white mindset, yet its been so well tempered with external and internal therapy and mindfulness (the real kind) that I respect his process a lot. He's from a more classist environment (ranging from the wealthiest of relatives to the elders struggling in home country) but actively rejects it, though he's materialist enough to like toys and small signals. He had to be real to deal with poor me, really. He's generous socially, for the most part. He was moderate right wing when I met him, now he's probably left of (the public face of) Sanders (and kinda me). And he's always conscientious of how he's coming off and how that can impact his teams/family/partner/friends. Oh no, humblebragging. But the point is that if I can spend most of my time with this guy, why should I tolerate a little piece of shit unless I had to?