How do you cope in public?

So, I am a 21 year old bisexual guy. I have always been in relationships with girls, however, it seems that I am starting to develop a relationship with a guy I really like. That's all good and well behind closed doors and even telling people holds no problem with me.BUT, I'm scared of the little offhand comments that we'll get in public, even by random people just talking/whispering amongst themselves. I know its common, I have seen it in fact. Even those who claim to not be homophobic still feel the need to point out, 'oh look at them gay guys'.How do you cope with these kinds of comments? I don't know how I'll deal with it when it happens to me, whether I'll lose my temper, cry, strop, or simply just be in a bad mood. I just don't know?!?So, how do you deal with it?