They called sh!t tests to me. They test my composure, if they can't bother me with their insults, they throw their bodies at me. Kind of scary, but true.
If they talk obnoxiously, and offensively regularly, there is probably something pissing them off. I take it as a sh!t test to see if I can find the problem, fix it, and at the same time not give a **** that it's happening. The only girls I really talk to are going to be my friends, want to be my friend, or are my friends problem. Everybody is a friend, or a useless enemy.
DJDamage talks of useless enemies, if they mean nothing to you, tell them to get out of your face, you want to keep doing what you were doing when they interrupted you with their ****y comments.
Otherwise, if you are approaching them, and they don't want you around, they will be obnoxious, just to tell you to get away and to stop bothering them!