Because in this world, people are very stupid. By stupid I don't mean not liking a show, but I mean when people dislike other people for being into something that isn't actually bad. These people shrug of the show as just a little girl's show, which it is, but they don't ever consider that the content that the show has to offer may be of good quality. I'm not saying these people have to give the show a try, but it's really stupid to me that they automatically think that something aimed towards a young and female audience is complete garbage. I personally find that things designed for people of all ages are much better, because they're often much less realistic and a lot more visually appealing and fun. It's not bad to be into more mature things, but people need to accept that lots and lots of content, whether it's for children or not, may or may not have good quality.