Why do people think there so cool even though their not?
Delusion.In its serious 'forms', it can be a psychological disorder- Megalomania Delusion
If a person feels he's cool then he'll be cool no matter what the other person thinks
They are trying to b cool!
They are idiots
Because they're spoiled people who don't know or care how others feel.
It's called EGO. Hahaha