Of course not. My husband is white, but I have pointed out before that I am one of those lucky women who has always been attracted to a wide variety of men, and also realized at a relatively early age that I should take full advantage of that attraction to find exactly what I was looking for in a partner in terms of real compatibility, rather than race. I encourage all sistas to do the same, and I have never seen advice on any of the blogs that contradicts this position. My entire purpose is to encourage BW to always seek the best wherever it may be found, and any good man who adores you from your eyebrows to your toes is to be enjoyed for the treasure he is.
On the other hand, I speak from a specific place (the United States) which has a specific population. For women seeking eligible, compatible men, they are probably best served by seeking men in those groups that contain the largest number of potentially eligible, compatible men--and for women in the U.S., Canada, and Europe, that will be WM. Siginificantly as well, for American, Canadian and European women, they will generally have more in common with men who have been reared in these cultures, even if those men are white, then they will with men reared outside of those cultures, even if those men are not white. Very often, we our encouraged to consider ourselves part of some monolithic "people of color" united in interest against "the white man," which often isn't a very accurate depiction of our real world experience.
Additionally, I must also speak honestly from my own experience--and my experience dating Hispanic men specifically has not been particularly positive. I have found that many Hispanic cultures are freighted with the same sort of racism, colorism, and anti-BW discrimination that can be found in the black American community. I have found the same disdain for dark skin and blackness among Asians, especially for dark women--all you have to do is look at the most esteemed female beauty icons of China, India, Korea, Thailand, etc. to know exactly what I'm talking about: the women are often literally white-skinned, and have often had their eyes and noses surgically "enhanced" to look more "Western," i.e., white.
Perhaps ironically, I have found that WM are the least likely to be color-struck, and the most likely to find BW's dark skin, tightly curled hair, and full features beautiful and appealing. Since I also find my features beautiful and appealing (LOL!) and have no interest in altering them, I can only be with a man who appreciates me as I am, unbleached and unaltered. I have often heard the same thing from AW in explaining their own preference for WM, who they say appreciate their natural slanted eyes, broad noses, and golden skin in a way that many AM don't.
Again--this only reflects my experience. I know that plenty of BW have had bad experiences with WM, and good experiences with AM, HM, and BM for that matter, and I would never discount that--and I would never tell any woman to exclude an entire group of men from her dating consideration. I always say if he makes you laugh, he has a good character, and you get that little "flutter" in your stomach when you hear his voice, it can't hurt to let him take you to lunch. **shrug**
I just think that sometimes the congruent trap to "nothing but a black man" is "anything but a white man." I would never presume to tell anyone who to be attracted to or date; but abiding by these kinds of artificial restrictions is quite simply a trap. Always do what feels right, but don't exchange one straight-jacket for another.