Family member uses my aspbergers as a weapon in fights?

ok so i have aspbergers. me and my sister dont get along we constantly row about things recently she discovered i have aspbergers, for example i asked her when she would be done on the computer once and she said "atleast i can make freinds you freak". when it is used against me i flip out and break things so clearly i dont take it well. ironically my sister is the one who fails at demonstrating empathy. how can i prevent my condition being used against me?