Why do people hate on a group/singer?

1. They're insecure.
2. They are just angry that their bias lost to that group or singer.
3. They think they're not talented or ugly (which is objective).

And a gazillion other reasons that I have no idea of.
Seriously O_O Haters these days...

I could kill them. <a href="http://media.photobucket.com/image/key shinee gif/Zlish/SHINee/Gifs/Keybeating.gif?o=112" target="_blank"><img src="http://i772.photobucket.com/albums/yy10/Zlish/SHINee/Gifs/Keybeating.gif" border="0"></a><a href="http://media.photobucket.com/image/key shinee gif/Zlish/SHINee/Gifs/Keysnort.gif?o=117" target="_blank"><img src="http://i772.photobucket.com/albums/yy10/Zlish/SHINee/Gifs/Keysnort.gif" border="0"></a><a href="http://media.photobucket.com/image/key shinee gif/bekkiglittz/GIFs/Shinee/5b325653.gif?o=106" target="_blank"><img src="http://i106.photobucket.com/albums/m274/bekkiglittz/GIFs/Shinee/5b325653.gif" border="0"></a><a href="http://media.photobucket.com/image/key shinee gif/bekkiglittz/GIFs/Shinee/f544e316.gif?o=108" target="_blank"><img src="http://i106.photobucket.com/albums/m274/bekkiglittz/GIFs/Shinee/f544e316.gif" border="0"></a>

As you can see, my ultimate bias is Key XD