I am white, and I have always found Viola Davis beautiful, or Denzel handsome. I have nothing against a movie with a lot of non-white characters, as long as they are good and close to mainstream. And I just won't miss a movie with Larry Fishburne, or even Samuel L. Jackson. I admit I am not a big fan of African culture, starting from design and ending with the music, but that applies to other cultures as well, and I bet most of us feel most comfortable within our own culture and ones that share many common things. I admire and dislike the same things in all people, regardless of characteristics that are beyond their control.
Every community protects its own and sees people who are different as outsiders. It's just human nature. I know how you feel, because I am an immigrant. Every outsider mistake is put under the microscope and amplified, while "one of ours" gets just a wrist slap. There is this legend that America is tolerant; it's far from true (on an absolute scale). America is just more tolerant than many-many other countries. As soon as you learn to accept that, you will become happier. Political correctness is not the solution; the solution is to live and let live, be the best (human being) you can be and prove them wrong by your own example.
There is this (true) story about WWII that I remember reading. The worst pogroms against Jews were not in countries and cities where there had been a lot of antisemitism even before the war, but in places where everybody had apparently been tolerant to them. That's why I personally consider PC to be so dangerous, and I think free speech should be encouraged whenever it does not incite to violence, directly or indirectly. I prefer to know who to stay away from, rather than a sneak attack from where I expect it the least. Also, I'd rather have people express their feelings, than bottle them up and get much more frustrated.