Depending on exactly what you mean, I might or might not agree with the premise that the segregation is greater. But in any case, I don't think it has the same effect.

Geographic segregation means some whites may encounter very few blacks. Economic and political segregation doesn't mean that men do not encounter women and vice-versa. Social segregation is one of those fuzzy things again. Yes, most people have a biased sex-ratio of friends, but the world isn't Saudi Arabia, and men and women do see each other daily. The fact that blacks are a minority, whereas women and men are near parity also affects things.