They might hold the opinion, but they also recognize a few things like how that is a matter of taste, and how tastes differ, and how that's ok and there is no one true taste, and if there were it would be inexcusable to assume that they embodied it, and aside from all of that even given poor taste, the importance of decorum is context sensitive, there are almost no absolutes and there is at least a few times & places for things that are normally unwanted, etc etc etc.
That's great! It won't stop people, myself included, from having a mini-flashback to childhood by doing something childish, but you're welcome to sit right next to me, being mad about it. :)
No. Just kidding, I'd find it funny.