Homophobia has a definition. Sure, if you're terrified of gays the same way you fear spiders, you probably are "homophobic". But most commonly it's just used to refer to actively hating gays. I don't get what problem HyogaRott has with that definition since he's the one who berated Joel about semantics and not understanding what some words meant.
Simply disagreeing with one or another gay rights viewpoint is not homophobic at all. At least not to me. But sometimes it's pretty damn tricky to judge what a person's opinions are based on.
Scalia's comments seem like a glaring example of harmful homophobia. Not that I care, I've never heard of the man or expect to ever hear of him again. The one thing that this thread taught me is that Americans have a keen interest towards their constitution. It's almost obsessive.