For obvious reasons:
-She’s a dumb pop star with dumb pop star songs instead of being a smart pop star with good pop star songs
-Despite her insistence she comes off as pretty homophobic
-She spells her name “katy”
-Her production team is the people who brought you Avril Lavigne, Korn’s post-adidas sell-out phase, Britney Spears, and the awful Liz Phair mainstream makeover phase.
For not so obvious reasons:
-she’s let her fame get to her head.
-for example, she demands her assistants track down old bottles of crystal pepsi so she can both drink and bathe in it.
-When asked if there was anyone she would want to play with in concert she said “Jimi Hendrix”
-she doesn’t like Airedale terriers
-she once ran over a homeless man and didn’t stop
-and she is TOTALLY encroaching on Zooey Deschanel’s look (who is awesome):