I don't think there's anything wrong with being bothered by the sight of two men kissing.
I'm sorry, but that's largely a gut reaction.
For some people, yeah...the sight of ANY body kissing in public bothers them. For others, the sight of same sex couples bothers them. For others, perhaps it's seeing their parents kissing in public or their little sister or their grandparents. Perhaps they dislike seeing large couples, or a couple where one person is larger than the other, kissing. Perhaps if they find both people ugly they don't like seenig it. Perhaps if they're just old they don't like it. Perhaps they generally don't mind it unless it's opened mouth.
I could go on and on.
It's one thing to suggest people should be accepting of gay people and things relating to it. It's another thing to try and tell people that their emotional feelings inherent within them are wrong. Why is it exactly that we can tell people it's wrong to suggest people stop being attracted to the same sex, but it's perfectly okay to tell people to not be repulsed by the sight of something. Both are emotions, are bodily reactions and feelings.
I think the over the top ridiculousness of "OMG! My poor children! They're scarred for life because they saw kids kissing" is laughable. However, the notion that "I just don't like seeing two guys kissing" is not some horrible unreasonable thing. Saying "I don't like seeing two guys kissing, but I don't mind seeing a guy and girl kiss" is not some crazy, unreasonable notion.
Anyone who says that they'd look at any situation of a publicly shown affection...or hell, let's make it easy and just say "kiss"...and would NEVER find ANY version of it bothersome or unsettling or gross or just kind of "ugg" is probably not telling the truth imho.
This is taking it a step too far in terms of the attempts to force "acceptance" into society.