why should they do that
lol...wow....there are multiple reasons for this question.Sometimes girls and guys cannot get along because of their attitudes. When a guy made a mistake in his past it will surely affect his future. another reason>> if a male thiks that a female like them, then to male would try to act mean to get some distance from the female. There are more reasons but if you are a female then try to ask a guy and find out what he say.
Because guys like girls and don't know how to express themselves. Guys are always mean to each other but don't take it personal. Girls are more sensitive and take things more personal. The older the guys get the more respect they give girls. If the guy is mean to you stay away from him. It's only bad energy and you deserve better.
Dont know how old you are. But there is a simple fact. Some guys are ASSHOLES.
It happens that its a method to try to hide that they like you. But it can also be the first one.
I myself have this girl that I cant stand. I dont show it very much. But Im not nice to her. Everyone knows I HATE her.
But another girl. which i love. I fooled with her. In a mean way.
If thats the case then he will pay for it with terrible regret.
I think Guys are not mean they just want to do friendship with girls and when girls become serious in their relationship then they become mean with girls because they don't want to maintain any serious relationship and when they fully know a girl they become mean so they can easily left her.