To be perfectly blunt, I'm not buying it. There are definitely aspects of aversion to homosexual actions that are instinctive, but hardly all of it. Personally, I'm not particularly repulsed by, say, two attractive ladies going at it -- but I still think it's ethically wrong. I am pretty grossed out by male gay sex, but I'm more grossed out by certain sexual acts that straight people do, even though I'm willing to label the first wrong, but uncertain about the second. So for me, at least, there seems to be a wide spectrum of responses -- gay and gross, gay and not gross, not gay and gross, not gay and not gross. So even accepting that evolutionary reasons for finding teh gay gross are probably at play, I don't think it's fundamental (Or even particularly important) for the moral reasoning going on in my head -- faulty or not.Elrohir: They're comparable because they both rely on instinctive disgust (either of 'the other' (racism) or of 'the unclean' (male homosexuality)). Instinctive disgust is pretty strong, and is hard to overcome with logic.
They're also comparable in that both race and sexual orientation have a strong innate component. They also have a social component, don't get me wrong. But the innate aspect is pretty strong.
Neither homosexual behaviour nor race generate moral disgust. We don't observe them and say "hey, people are being harmed! Don't do that." Moral disgust kicks in when we observe abuse or violence or harmful hypocrisy. The disgust due to race or sexual orientation is instinctive and has decently obvious evolutionary connotations.
People will try to find moral reasons to find homosexual behaviour disgusting, and some of that reasoning is decently good (HIV transmission, for example, is a good reason to suggest that gay people abstain from sex unless they're in conditions of safety). However, the majority of these reasons are merely justifications: post-hoc justifications to correlate with internal instinctive disgust.
People also tried to find moral reasons to make racism acceptable too. "Take care of your own family first" still resonates, but we've all seen instances of people trying to suggest that other races were less moral and more deserving of poor treatment.
The OT Bible is a really good example of both. Kill homosexuals because God finds them disgusting is right there as if spoken by god, the instinctive disgust is rationalised with moral disgust. Or Kill the Canaanites because they're descended from Ham, is racism rationalised with moral reasoning.
So, racism and homophobia are similar because they trigger instinctive disgust and because they're about innate traits.
edit:, x-post with the above conversation about being disgusted!
And I find it hard to believe that I'm special in this regard.
(Also, I think there's also moral disgust going on. And there's was no commandment to kill Canaanites based on them being descendents from Ham that I'm aware of.

I wasn't trying to be offensive.Don't suppose my motives. I don't want to be a jackass.
No no, you misunderstand. I'm not asking you to rebut the argument that you didn't understand, I'm asking you to more clearly state the argument that my argument was directed against. More clearly: can you please state why you think racism and homophobia are similar to equivalent, and in what way? (You said that the comparison was apt, without going into detail: how is it apt? Is it inapt in any way? etc) I want to be precise as well, but I think it's best if we start with you being precise, so that I can make my own response even more precise.No, I'm not letting you off that easily. I'm not slow, El, I want to be precise in this conversation. If I couldn't ask for clarification, the interpretation I'm going with is just completely off the mark. I think we have different analogies in mind, which is why your post doesn't seem relevant. I don't want to rebut a case you haven't made.