Not all of them, certainly not holding hands, hugging, etc. but slobbering all over each other tongue-down-the-throat whilst engaged in heavy petting or more, yes, that is inappropriate in public. Even when I was younger ("Get a room" I often muttered). And that attitude was and is definitely NOT restricted to homosexuals, whom I might add, in my limited experience, are far LESS likely to grope one another in public than are heteros.

In simpler words, "Why is one's sexuality such a big goddamned deal?" I seriously don't get it. But I will admit that I am of the strong opinion that anyone claiming the need for "special consideration" on account of it is a loon.