I don't understand why college students think they are smart
Do you think that college students aren't smart?
They think they know everything and that they're the best.
College students are generally young and still have a lot to learn, but it is wrong to just all of them together as a group. Just because some college students are know-it-alls doesn't mean they all are.
I'm just stating that I hate college students and I don't care about their opinion.
It's true that some college students think they know more than they do. But general judgments can be harmful. They'll learn soon enough that they don't know everything, just like the college students before them.