According to this one, blacks are more disapproving of homosexuality.
But they are less discriminatory.

I'm sure there's more out there (probably contradicting these findings). But this is the first one that came up in my googling

http://m.poq.oxfordjournals.org/content/67/1/59.short

Black homophobia has been cited as a contributing factor in slowing mobilization against AIDS in the African-American community, as an obstacle to black lesbians and gay men in coming to terms with their sexuality, and as a challenge to the legitimacy of the gay rights movement. Yet evidence that blacks are more homophobic than whites is quite limited. This article uses responses from almost seven thousand blacks and forty-three thousand whites in 31 surveys conducted since 1973 to give more definitive answers on black-white attitudinal differences and their demographic roots. Despite their greater disapproval of homosexuality, blacks' opinions on sodomy laws, gay civil liberties, and employment discrimination are quite similar to whites' opinions, and African Americans are more likely to support laws prohibiting antigay discrimination. Once religious and educational differences are controlled, blacks remain more disapproving of homosexuality but are moderately more supportive of gay civil liberties and markedly more opposed to antigay employment discrimination than are whites. Yet religion, education, gender, and age all have weaker impacts on black than on white attitudes, suggesting that black and white attitudes have different roots.