How should I distinguish between these types of people? Is there a way that doesn't require me making small talk with lots of people who I don't like?
Perhaps start by actively distinguishing between "people I actively dislike" and "people who I don't actively dislike, and am assigning the dislike label to based solely on my prior that I dislike most people".
Also, in regard to inauthenticity, do you regard making small talk as inauthentic, even if you are saying true things? For example, is it inauthentic to pay someone a compliment if you honestly believe the compliment, but are only making it as a way to start a conversation and find out whether you like them? If yes, I suggest you ...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.