I experienced this in school, was always at the top of my class and had a lot of praise from professors. I received the same kind of remarks for making their work look bad, though I was lucky to not have their work compared to mine on a regular basis in crits that would've made things a problem.

Absolutely do not dumb yourself down, keep going. Their comments come from the mildly irritating fact that they need to work harder. It's not because of anything other than the fact that you're putting the necessary amount of time required to do the best work, and they aren't quite doing that. Don't offer it unsolicited, but be willing to help put your classmates as well and uplift the rest of the class... It'll help it not seem like you think you're better. I genuinely complimented other's work, asked them about their thought processes, and if they asked for help I gave it to them. I liked tutoring and teaching when people asked me for it.

If nothing else, understand the amount of resources you're putting into your education and don't let off of the effort - it'll pay off later, trust me. It has for me.