Okay, let's start by saying I love High School Musical. That having said, I think people are stupid. Not because they hate on shows and / or movies like High School Musical without even watching it, but for condemning people who actually do love these shows.
There's a reason TV Tropes has a special tropes page for it, and have it a subtrope of Hate Dumb. To me, it's okay to not like High School Musical, yes, even if you haven't watched the movies. But I think it's fairly stupid to hate the people or kids who like it.
Sure, High School Musical is for kids, mostly for those of young age. But who cares? I don't berate you if you like to watch The Godfather, I know a lot of people who find the trilogy boring as hell, me being one of them. I actually applaud you for liking In The Name Of The King: A Dungeon Siege's Tale, one of the few Uwe Boll movies I happen to like. I have a big disliking to certain stuff that's mostly a local trend. I have a very disliking towards Hannah Montana, but mostly due to the fact that Dutch dubs are pretty stupid. I absolutely think Lost is terrible, just like Sex And The City and Desperate Housewives. But I can understand if people like any of the above. These series or movies were made for a specific demographic. Most are not made for people like me. There have been a lot of crappy kids cartoons on television, but then I think, I'm not a kid anymore. Sure, I love Phineas and Ferb, Filmore! and Kim Possible, and they're not exactly made for me. But still, most of these shows are up to the kids themselves to decide. When I was younger, I knew which shows I liked and which I didn't, so I am pretty much sure that kids nowadays still have their own opinions about television kids shows (although they don't really have a perfect judgement about everything, seeing as the kids top hits list is still filled with kids unfriendly songs).
Thing is, I like High School Musical. What do I like? At least it's not the plot, seeing as it's pretty generic for the first two. To me, it's mostly the songs and the dynamic between the actors. And the third does have a rather unique take on the entire plot. It most definitely is a Disney worthy movie. It's not really that I can't explain why I think High School Musical is great. It's that I shouldn't, because you have to make up for yourself why you like or don't like it. Although I do have to say that to like it requires you to look past the stereotyping of each character for the first two movies. The third movie throws any form of stereotyping away, as it is a conclusion to the first two movies.
To someone who doesn't actually watch the movies, only see the movies, it seems as if it promotes shallowness. That's partially true for the later movies and pretty obvious in the first movie, but throughout the movies this image gets thrown into the garbage disposal unit more and more as time goes by. It also doesn't really glorify high school. Sure it draws a more perfect image of high school, but what movie doesn't do that? It's pretty close minded to not allow your kids the pleasure of seeing a perfect world, just to shield them from disappointments. You don't protect them, you only make them more pessimistic, therefore ruining their chances of actually trying to get better. It's this perfect image of a world that thrives kids to actually achieve a happy ending for themselves. Sure, a lot won't make it to such ending, but it's the journey towards it that makes it all worth while, even if you don't achieve your goals. It's the dream that pushes us to actually live.
But anyway, I'm pretty tired. I don't need to do this. I don't need to tell people that it's fairly stupid to call on people just because they like something you don't. It's common knowledge.