I don't understand why people who don't like some artist go to concerts or listening music on youtube of person they hate. If i don't like something i don't watch it, it's really easy.
Remember when a few years ago my photos from one photoshooting were on a lifestyle site in the internet, it wasn't pleasant to read comments about myself like: "that girl looks like sh*t", "she has to be stupid and vain" or something like that, but now i understand that every person who do something public are exposed to be hated (and love as well). Every artist has haters. Only people who do nothing with their lifes are 'safe'
For me Katy is a complete artist and even don't read bad comments on youtube and think stars also do not it.