There is a personality, or social style, or something, that I find unpleasant and very challenging to deal with. IDK its real name, but I think of it as smth like "instant and constant disapproval".
There are people who seem to use this as their coping mechanism for life. They find reasons to be annoyed with their environment and people in it. They don't hide it. There might be a small number of people they are generally pleased with, but I've seen that often those people just do what the constantly-annoyed person wants, which is of course quite nice.
I assume this approach to life gives people a sense of control or familiarity. I also think it might, for some people, be due to basically innate ongoing discomfort due to whatever biological processes lead to colicky baby syndrome, DMDD, and a host of related conditions.
In any case, it takes a toll on me. I find it deeply frustrating. I've spent a lot of my life learning to avoid those people, because I am almost never able (or inclined) to spend the time and energy needed to figure out how to live up to their internal standards day by day.