What do I do? Well, I listen to Kanye West. Here's a couple of reasons:
-He has to deal with a bunch of them. I think the criticism is somewhat justified, but the extent of it is really overblown.
-I find his music (the most important aspect of him) to be quite positive. His swagger is rather infectious and his songs always leave me in a good mood.
So, if you have to deal with haters, my advice is to find your musician/performer/whatever that you can feed off of and enhance your mood. And always remember that even the greatest people have opposition.