Occasionally, schools are horrible & teach children the wrong thing.
Nonetheless, you should respect your teachers because they are under harsh judgement from God. James 3:1 says "Don’t be in any rush to become a teacher, my friends. Teaching is highly responsible work. Teachers are held to the strictest standards. And none of us is perfectly qualified."
Reread that if you have to. NONE OF US.
Most public school have some weird thing going where the students are taught to believe Christians are hateful, mean people who suppress freedom, and are backwards thinkers. I've seen it. I mean, I am at a public school right now. But the thing is, we're not that way. If anything, as far as I've seen, Christians have furthered the cause of freedom, and led the change in most innovation.
Remain strong in God. Read your Bible. Become versed in apologetics, the defense of our faith. Be kind, and don't get angry when they insult you or your brothers and sisters in Christ. If you go through the fire unscathed, you'll be rewarded with a stronger faith, a closer walk with Jesus, and something beyond our temporal sight.