Sick and tired of homophobic people?

I'm in 8th grade and out with the fact that I'm bisexual for nearly a year. I am the only one out at the moment. People have been really supportive about my sexuality and even if they weren't comfortable with gay people they seem to keep it to themselves. But there is always that one group of people who just absolutely hate homosexuals. They give me a hard time by always asking "if I liked men" and other ridiculous questions like "are you really gay?" just to downplay and humiliate me. They treat other people fine but it's always me that they seem to treat like sh*t. I can't take it anymore. I've already tried talking to teachers but they only make the matter even worse and I don't want to tell my parents because they don't know about my sexuality. I'm happy to be who I am, I don't feel scared or threatened when they bully me but it pisses me off that they treat straight people with respect and treat people like me like garbage. What do I do?