I used to think black men were using this as an excuse to justify dating non-Black women (hell, I still think SOME of them are). However, I have to admit my eyes have opened in recent years. I have seen several cases where there have been black men who sincerely wanted serious relationships with certain black women, but would be turned down for being "corny", "weird", or "boring". Some of these men would take this rejection pretty hard too and become bitter towards them (hence a lot of the black female bashing that you sometimes see from BM with WW).
Let's be honest, a lot of black women don't want to admit it, but some of them do have a certain idea and standard of the kind of black man they want and most of these guys don't fit it. White women on the other hand are not only more open to dating these kinds of BM, but are very aggressive in pursuing them.
Black women don't realize that these are the type of men who would be the most suitable husbands and providers until it's too late. I'm not going to blame all black women though, because I know that for some this isn't the case. But this is something that I'm taking notice of more and I don't think it's emphasized enough or taken that seriously when the subject of BM dating out comes up.