How do I address this hypocrisy in my PRIVATE school..?

I go to a hypocritical school and I am always having to stick up for gays. why you ask? am I gay am I straight? I don't need to say cause it doesn't affect my point. This guy kept saying GAYS ARE GOING TO HELL (and I'm not saying thats true I'm just thinking in his OWN ideology). and what makes me mad is he does ual immoral things with his GIRLFRIEND and it says the ually immoral will not inherent the kingdom of heaven. I really am tempted to say well in the exact same verse your using THEY TALK ABOUT YOU STUPID, but I need to think of a good way to do so, or should I just let it go. the hypocrisy is eating me alive...and you don't have to agree with his ideology but I mean his own ideology would damn him to hell if he didn't change, many gays are monogamous