There are many things I want to reply to in this thread. For example, the guy who listed "Rappers, Lady Gaga, Britney Spears, Miley Cyrus, The Jonas Brothers, Justin Beeber" all in the same category. Wow man, way to flippantly dismiss an entire genre of music while clearly having very little knowledge of it.
When it comes down to it though, this (the original post) is an argument I see a lot on Youtube when watching a Who video or the like: someone invariably posts something to the effect of "I'm 15 years old and I listen to good music like this and everyone else my age listens to crap music look at me I'm so enlightened and mature blah blah." Now, this is not quite what you're saying, but the sentiment is the same. Even people who are disagreeing with you are making one certain point that really irks me.
Basically, Ke$ha. Let's talk about Ke$ha. We could insert plenty of other names there, because what we're really talking about is the latest pop sensation that immediately becomes the punching bag for everyone who listens to "real music" and hates all this "pop garbage" and rawr rawr get off my lawn you little rapscallions etc etc. This is something that bothers the hell out of me. You assume that, because she's popular and commerically successful and the kids like her that she must be garbage (and natrually must barely have any creative control over her music and is probably some vapid idiot just coasting on being mildly attractive and having good producers).
Frankly, I think that's a really ignorant view. Because honestly: you don't really know. Just because she is not making the music that you like you assume the music she is making is shit. The question I have to ask everyone holding that opinion is: have you ever tried dancing? Instead of sitting down listening to your music and snobbishly calling down from on high what is good and what isn't, have you tried actually getting off your ass and moving around to the music? Dancing to it at a party? A club? No, because only those damned kids go to parties and clubs and ew there will probably be girls there and they're all sluts and probably on ecstasy anyway and etc etc. Not all music is about the lyrics or the awesome guitar riffs or the musicality. Bach had some wicked musicality but when I want to drink and get rowdy I throw on some Dropkick Murphys. Sometimes, music is about the mood and the energy, how it makes you feel and how it makes you move. Different kinds of music for different kinds of events.
tl;dr: Just because someone is making music that you don't like doesn't mean that music is terrible. Maybe you're forgetting to actually enjoy yourself.