I think why some people are so flamed up at Boxer's reply is because it seems like it singles out black men specifically. While I have seen many East Indians with ''black'' features, from the way he typed it sounded like it was too mean,"I would date an east indian with thick hair and very dark skin, but not a black man with lighter skin and less thick hair, for the simple fact that he is black."
Side note: I actually saw an east indian today with stereotypical black hair....i stopped and stared

. He must be from the southern tip of India where people look more like the Australian Aboringes or something. I'm pretty sure he was from India too.
I also think the sensitivity you see from people getting rejected by race has to do with numbers. When a minority gets rejected because of race, he may feel like all or most people dont like him because of that. When say, for example, a white man gets rejected, he may not take it to heart as much because he knows there are other people that are going to like him. This is assuming they both live in a majority white country.
People in both the minority and majority often say things without taking into consideration the other sides view of things. Not everyone is offended by such statements and many people just brush them off, at the same time, people can be VERY offended by other statements. People tend to favor people that look more like them naturally (very general statement of course).
It's the same in many countries, like if a white guy were to go to a majority non-white country, he would find that the non-whites in the majority, male or female, tend to prefer their own. This may cause a foreigner in the country to feel isolated and take rejection personal. The thing is that it seems like people are more likely to accept rejection and move on in Eastern countries more than Western countries.
Perhaps it would of come across more lightly if Boxer had said,"I really only find people that look like me attractive". That would probably automatically eliminate most "black'' men.
This is why I sometimes feel people would be happier if racial segregation was still law, but other races recieved equal rights. That way nobody's feelings get hurt, there's no interracial crime, no people of one race pointing fingers at people of other races, ect.