Or should I lose hope in humanity completely now?
Depends, this really depends on what exactly you consider being a twat, how old is the person in question and what kind of people they surround themselves with/what sorts of experiences they go through.
I’ve seen people mature tremendously and they were cases I considered totally hopeless. In contrast I’ve also seen people who appeared to have their sht together, suddenly flop in the most stupid of ways.
This answer I think is the closest. People can get better or worse over time and there are just so many factors. I’ve seen kind people go through horrible tragedies and become bitter and isolated. I’ve seen people who were cutthroat ladder climbers come to realize that the ladders aren’t going to mean anything after a certain point and their legacy is going to be kids who don’t want to spend time with them.
The one thing I’ll say that seems to be often true of men is that when they get older the testosterone is less intense and so life is a little less driven by it.
