Society may have views and perceptions so I'm not ignorant of the fact that yes people appreciate beauty, but I have my own mind so I personally don't judge a book by it's cover. I may have some initial judgement, but we all do that based on first impressions, but that never affects how I act towards someone. I treat everyone equally and with respect, even if they're an asshole, I either kill them with kindness or just walk away. To me though, just seeing someone as handsome doesn't constitute in my mind "oh this person is probably going to be a jerk or spoiled because they look similar to other good looking assholes I've met in the past".
You say you don't judge people but you make your opening header "why I don't like handsome people" and state you've studied numerous people on their behavior and have concluded most of them are not people you enjoy being around. Personally speaking, even if I met 100 nice looking people and all of them were narcissistic I wouldn't chalk it up to their beauty because in the end a person is who they are for whatever reason. The beauty they have could have made them vain, but other factors play into it as well, it's never just one reason.
Basically I just look at this as a closed minded view on a specific group of people and is highly subjective. I also don't really look at the world personally in terms of beauty and ugly. I can if I want to and I have (I'm human), but if someone is interesting to talk with and I think they're fun to be around, why do I care what they look like? I've meet amazing people of all shapes, sizes, colors, personalities, etc.
For me beauty is something that makes a person shine. People that care about themselves in the sense they want to be the best they can be, people that care about others, or have a passion for something; to me this is real beauty. I also think to myself that aesthetic beauty is fleeting since everything changes with time.
I don't have anything against people with physical beauty since as I've said I've met all kinds of people myself and not all are bad. I'd just continue to meet more people and even if you think this, it's not always true, people can surprise you lol.