is it bad that i flirt by being mean to girls?

It's bad. Everyone should be treated with respect.

I would not be man to anyone. Boys or Girls. Men or Women, Ladies or Gentlemen. That serves no purpose and only exposes a weak character. I say that NOT to be insulting. I do not know you. But mean is not how those in a civilized society treat others then deem as having worth and merit.

yes

Only if your girl is okay with it 🙂
Else buzz off 😡

Yes being a jerk is a dickhead move

Depends. Some are intrigued by that, but others are not.