What should I do? I don't know why they didn't like me.
What kind of people or specifically, what characteristic did they have ?
I can't pinpoint the specific traits, I only know that people don't like me.
People are just very fickle in this world nowadays and like who they like. Ask them why they don't like you, because if you don't you might not ever find out the reasons.
Give me a break, your lecturing me like I do something wrong.
You shouldn't expect or look for other people's approval of you. Just have manners and be respecful and you should get on just fine.