You all have every right to think and express your elitist attitudes. Others have every right to ignore them. In fact I ignored such attitudes just last week. My nine year old has status with USAir and just upgraded herself and her nine year old friend when she went to Disney World last week. Her friend's parents choose to sit in the back because the father is uncomfortable with flying and likes to sit over the wing. I know my daughter, and I assume she behaved, but I don't know for sure that she didn't do something to annoy the other passengers. If she did, I'm sorry, I wish it wouldn't have happened, but the prospect of it didn't stop me from letting her have fun with the idea of being upgraded. USair had no problem giving them the upgrade, so I assume that they either didn't see an issue or they aren't allowed to prohibit it under the rules or maybe the law.
Since some of you don't have kids, you can probably be excused for not knowing much about it. But you post as if you do know. Even a fantastic flyers can have a bad day. That applies to babies, kids, and adults. And sometimes it may seem that a parent isn't trying to quiet a baby or child when they actually are. The parents know how their kids react to things, and sometimes the best way to stop bad behavior is simply to ignore it. Paying attention may be just what the child is angling for.