Why do many black woman feel that they can only date black men?

From what I’ve gathered from tv shows, online articles, etc. it always seems that many of the black women that are interviewed feel like they should only date black men, and that that is one of the reasons why they also feel angry when they see black men dating non-black women. I just don’t understand this. 

Why can’t you just be open to every kind of man out there and be happy when you find the love of your life no matter what he may look like? Why hate on others happy relationships just because the male-half happens to be black and the female-half happens to not be? I would like real answers here or even just comments on this issue. No racist remarks please.

Well I see that a lot of you took my "can" and "have" as a forceful sort of thing. I didn’t mean it like that, and I have nothing against people dating other people that look like themselves, I’m just trying to say that all peoples can have cultural similarites to peoples who look nothing like them. Some of you make it sound like if they are hispanic, white, black, etc that their culture is going to specifically be this way and mine (whatever race you identify with) is going to be this way so we just wouldn’t be able to get along as well. That doesn’t make any sense. 

Take a white American and a white European. Culture is most likely going to be very different. Actions, words, traditions, etc. It’s more your nationality that defines your cultural identity.