1. That is absolutely ridiculous. I mean really, I'm by no means homosexual, but I am appalled that such things have been done to those people. Yet the scary thing is, I'm not even surprised. Honestly, I would expect that from most of our closed-minded society. (I know that's not a fair assumption, and in actuality most people today probably don't think like that, but the worst among us certainly do shine the brightest, unfortunately.) Not only is this an infringement upon freedom of expression, but it could technically be described as an infringement on the basis of hate and/or prejudice. It's late right now, so I can't really elaborate too much right now, although I really shouldn't have to. Besides, any justification for my thoughts would simply be redundant ramblings anyways. I haven't been checking up on these sorts of things lately, but I am surprised I haven't heard of lawsuits coming from the banned couples. That is, of course, assuming that they didn't bring those incidents into court. Yet even more sickening, a lot, or at least some portion, of those at the places where the couples were thrown out were okay with or even happy that they got thrown out. The sad thing is that if those thrown out were a straight couple, people would probably be outraged, once again assuming they aren't already. I don't know why this gets to me so much, but it simply does.
2. This can be, pretty much, summed up as a form a prejudice. It truly is just as bad as excluding people based on race or sex, as this is simply excluding people, or otherwise exert some sort of negative treatment different from anybody else, based on sexuality, obviously. For some reason, this makes me want to lead into the whole "Is homosexuality a choice or is it natural?" ordeal, simply because I have actually once heard a claim as absurd as to state that "It's okay to do these things to gay people because it's a choice!(Insert herp-derp here)" But my response to that question is not only not necessarily appropriate for the topic at hand, but also too long-winded to get into right now. If people have such a problem with gay PDA, maybe it is those people who have to leave because, personally, I see not being able to accept others as a sign of immaturity.
3. So long as clothes stay on (if you catch my very-easy-to-understand-meaning *nudge nudge*) I really don't care. Be as affectionate as you want! But that is referring to a casual situation in which the general public are present. Of course, there are situations where more extreme showings of affection are inappropriate, and some where no showings whatsoever are appropriate. But what those situations are and when they are occurring should be obvious to the semi-intelligent person.
4.That's just sad. Not them for fearing, but the fact they have been put in a situation in which they would fear to express themselves publicly. You know something's gone too far when you've got people fearing to show who they are. Screw prejudice! It's practically terrorism at that point. Perhaps terrorism is too strong a word, but I think the point still essentially stands.