There should be a "I am least bothered" option. If they say it in front of me, I'll react if I feel the need. If its worth having a debate over, sure, I'll talk about it else just move on. If the person says it behind my back, as dishonorable as that is, he should have the guts to say it to my face. If he does, refer to answer given above else... well the person sucks too much/is a coward and either way, isn't worth me saying anything about.
Hope that makes sense