Behind the teen cliches

A classmate of mine came to me today.
He asked me what on earth we like in the way  my friends and I dress up.
He told me that we're all dressed alike.In a hippie way.
I told him that wasn't true.Each one of us dresses up in a different way.We are not trying to dress like hippies.
He said everything was the same to him.
I said him that he and his friends dress up,talk and behave in the same way.
He said me "we are friends that's why,we wouldn't be friends if we were too different from each other."
I said him that no one of them was looking alike at the beginning.
They started looking alike when they started doing company with each other.
He said the same thing for my friends and me.
He said that one of us influenced the others.
I said that his friends are trying to look like him.
We didn't come to a conclusion.
I still believe that each one of my friends dress in his way.But I haven't stop thinking about this conversation.