It's kinda on the same wave babies crying. Some parents just learn to block it out, while others, like myself are about ready to strangle them.
People think their dogs are angels and will put up with a lot. I've seen a lot, working in a petstore, and I think two things, first, why people let their dogs behave that way? it certainly can't be enjoyable for the owner, and the dog is probably acting out which means he needs to find rules and discipline, or are they just so oblivious to it, and don't want to admit their perfect babies are not so perfect.