That probably has more to do with the fact that it's not what, biologically, most people are built for. I feel strange sensations when I see someone who is physically incapable of walking, for instance, but I don't have a problem with handicaps. I don't go out of my way to hurt anyone different than me, but I also can't stop that gut reaction.
Are straight people bad because we have these gut reactions? (Assuming I'm not the only person who experiences this sort of sensation.) Is it any worse than you loving who you love simply because it's instinct for you? Personally, it does make me feel a little weird when I look at two people of the same sex making out, but it's none of my business, and if they're happy, that's awesome.
I don't call the sensation "sick" but it does make me feel weird. I'm sorry I can't help that. *shrug* I have a feeling I'm going to get the verbal **** beat out of me on this forum for being honest.