did i make her mad at all?

today in class we were using socrative.com and one of the things you can do with it is send anonymous messages and it will pop up on the teachers computer which sends her screen to a projector if the students join her chatroom. The teacher said to send something good about yourself to the message board. I sent "Im white" to the projector. I didnt really send anything and said mine wasnt connecting to the chatroom, When we went to lunch and on the way back, A girl i know asked me if i said it. i denied it and she bought it. I might have gotten a little defensive and toned in my voice because her friend and her laughed at me because i repeated myself a few times i think. I asked the same girl for a piece of gum and she just threw it at me without even looking and she was talking to other people.