Homosexual acts would seem similarly vulgar to the majority of people. And it is this vulgarity that the "prejudice" is against, not the people themselves.
And considering TuffStuff's "Neanderthal" comments were made regarding public acts or the advertising of these acts, I don't see what's wrong with the comparisons. Yes they're unpleasant, but is this whole issue not unpleasant?
I'm not preaching hate and I'm not saying homosexuals are defined by their sexuality. Despite the apparent reversal of roles on either side of the argument in this respect, still it is the same side that remains "Neanderthals" in the eyes of the other.
Bookmarks