Ain't that the truth? Me too and sometimes it really does get to me.
Myself, I blame it on the fact that in most places, people never grow up. They're perpetual children who can't be trusted to act respectfully towards those around them and mind their own business at the same time. And when everything is either mandatory or forbidden, people loose any judgement they might have once had. When the laws and rules and regulations are so pervasive almost everything someone does is controlled, people stop thinking about their decisions beyond what's allowed by all the rules. This is the behavior of a child, not an adult.
Rather than simply acting with common decency it's "Well, no one said I couldn't!" What does that have to do with it? It's rude. Just like getting all offended when, in a restaurant, outdoors, someone is vaping and they look like they're enjoying it too much! (real example here. Someone complained to management a patron at a distant table was enjoying vaping after a meal too much and needed to be asked to stop.) Gah. Give me a break. If you don't like it, look away. Note, it wasn't about the 'second hand vapor' or the 'smell' or anything, it was the appearance of someone enjoying something.
Next thing they'll ban are certain restaurants. "That person over there is enjoying his meal. I'm a vegetarian and I'm offended at how much he's enjoying his steak!" (said in a steak house)