@Great One
You don't have to believe me about being sx-first, but I'd like to chime in anyway.
For me, there's a very on/off energy. I may or may not be a true introvert, but most people would likely find me introverted--if I don't feel something special going on between us, I simply withdraw into my own mind. I stare out the window. I get lost in thought. This happens between me and most people. I'm perceived as cold, unfriendly, rude, shy, introverted, standoffish, whatever. I'd honestly rather sit inside my own head and think about my own shit than try to force a boring conversation. I've learned to give lots of "polite" answers to get people off my back (that's nice! Oh, I'm glad to hear that) etc.
On the other hand, if someone intrigues me, you'd never know how introverted I can be. Once, travelling across the US on a Greyhound, I met this sooper interesting person, and basically we talked for about 12 hours straight about all kinds of random stuff (most of it was trivial bullshit, so I can't use the "Introverted 5-winger" argument about me avoiding "inane conversation"). I was like, shaking with excitement the whole time, and the bus driver was like, You're grown adults! JUST SHUT UP ALREADY.
That's the on/off energy flow as near as I can tell. I just can't muster interest in people who don't strike me that way. It's not that I dislike them--it's just not the way I feel pulled to interact. It's not necessarily dependent on instinctual stacking, because I have a sp/soc 8w7 friend who I can blab away to forever--he's the most damn interesting human being ever.
If there actually is someone I actively dislike, that's quite different. It's also quite rare--I am tolerant of most, even if they don't interest me. If I dislike someone, I'm likely to avoid them, or else will pathologize them in my head whenever we interact. I might be polite (get along to go along) but I can't do that indefinitely. If the dislike is mutual, blows will probably come to blows, and I don't really care.