i know what your going through. Everyone at my school is dumb, and cannot except someone elses opinion, like me being a brony. but i've learned love and tolerate them to death, and if a friend can't except my interests and insults them, i think it's time to draw the line and just simply ignore them. real friends will be interested, and try to except your different nterests, not insult them. i have to congratulate you on how you stood up to this person though, i could never do that, i would think of a really good comeback right after the argument lool so you should just forget about whoever she is and try to find friends that will except you for who you really are.
-peace out!!!!