Knowledge is power.

Read up all the threads in the GM Conversations wiki. Then, realize, the people calling you "cheaters" are actually the ones that need your pity, and understand their superiority complex as the driving force for their baseless hate. It's not you with the problem -- it's them.

Sensitivity is well and good - but keep in mind. You're legitimately playing the game. They are harassing you. If they harass you to the point of quitting, I have to ask -- why didn't you report them to a GM and shove them on /ignore? It's certainly your right -- you're not the one breaking the rules. Harassment is very much against the rules.