This girl spat on me today infront of all the fellaws....what should have i done?

i am 15 and am quite popular in school. i have an ego and people look at me as the quiet guy who gets crazy at times. this week my house was getting robbed and i caught the guy and beat him up with a baseball bat and the same day i smashed a beer bottle on this guys head. so ppl look at me as some one who would not accept being mistreated. well today after school i was hanging out with some people.other ppl with status around the school. and this girl went by and all the gangster(black) folks started to make fun of her i was the only non gangster guy there(by the way im afghan, i dont even dress a gangster) so i was sticking out the most and of all of us there,i was laughing the least sicne they were making fun of her. so this girl approached me and after talking she choose to spit on me of all the people there tehy expected me to hit her and i refused. i just whiped it off nad they started saying stuff liek" ur a , i would neva *** to school"what should i do?