Two girls at my school..?

are like messing with my friend and I. :/ Ok so today at PE we had to play hacky sack and have groups of four and play together (I know it's silly :P). I was trying to do this one trick and the ball ALMOST hit her head but did not and I told her I didn't mean to and she still got mad. She asked for the ball and then she got it and kicked it like 15 feet away and was like "someone get that" or "I'm not getting that" and my friend and I kept going for the ball because she did it like 5 times! Then when she told me to go get it again I got the ball and threw it and told her "I aint getting that" trying to mimic her. Then she yelled to the teacher like "Mr. Gerhard they are throwing the ball and telling us to go get it!" and she did it to us like 5 times. I then was saying my side of the story that she kept doing it to us and she wasn't even trying to do what we were suppose to and it's her fault. He then gave us our own separate and my friend and I separated from the two girls. We went off somewhere else to play and then the girls kept following us and throwing the ball our way (maybe trying to hit us?) and kept saying "oh can you get that". I decided to just give the ball to them and didn't exactly throw it good and went a little bit away from them and they yelled to the teacher "Mr. Gerhard they are throwing at us!!" and my friend was just like WTH but I told her "Who do you think he's going to believe, them or us?" and I said that because he knows us and the two girls weren't very good students and would show up late a lot and not dress good for PE but they decided to turn my words around. They said "is that supposed to be racist?" and "did you say that because we are black" and I was so annoyed with them. Then we had to go line up to go in the locker rooms to dress and when we were sitting down they kept pointing to us and called us "Dora and Boots" which I thought was pretty stupid but yeah I think they are acting dumb and over reacting. I think they are bored and don't have anything else to do so they have to bother us :P And judging by how they act I am guessing that they will continue bothering us and following us and talking about us since we have the same PE cl. I told my sister about it and she said like "If they ever get to the point where they want to fight you just say that only ghetto people fight" which I think I would say but I hope I won't get in trouble for it. They better not start a fight or something because it would be pretty stupid. I mean starting a fight because of a damn hacky sack ball incident? Wow they must be really bored with their lives. So I just wanted to see what you guys think about it.