Assaulted and Thrown Out

I must have been around 19 when I remember I had my back to a girl who would not stop groping me, 3 times I had asked her to leave me alone, and on the 4th I grabbed her wrist and made a scene and shouted quit touching me, only to be set on by the 3 boys she was dancing with and be thrown out the club, when I tried to explain the situation to the security, I was met with the response of, why on Earth would you be mad at that?