I have this idiot classmate...?

I'm in 7th grade and there is this a**hole who is friendly to me and my friends most of the time, but I heard him talk trash about my group of friends behind my back countless times. Just to be clear, his group of friends are the morons that get bad grades, brag about smoking and doing drugs and they act superior over my group of friends. We are the geeky kids. We discuss video games, computer hardware and smartphones and other related things most of the time (but we do talk about other topics too, just to be clear). When we overhear their conversations in which they talk sh*t about us, we just laugh at them, but deep inside it pisses me off. How any of these cretins be superior, and more succesful in the future, than someone who mastered Windows at the age of 9? Not to mention, I am a very sociable person outside my "geeky" world, or have a life, if you will. Should I just keep on ignoring them or what? On occasion, they do approach us (or one of us) and try to insult us, but we overrun them with better arguments.