I sometimes dislike him.

I'm not mad for him nor do I hate him to death. He is kay. I do not listen to him, not much. Only two songs of his, Baby and As Long As You Love Me.

His attitude and behaviour are absolutely terrible.

Don't like his songs, they tend to be a bit plain for my liking. I once saw him sing live on a morning show (actually singing, not lip sync) and he can sing quite well without all the autotuning, but his music is just so boring (some of his songs have about 2 notes in). He'd be a lot better if he tried being more ambitious with his music.

His songs and swag are awesome!

Definitely not my kind of music at all and he himself seems really annoying but 'hate' is a very strong word so 'dislike' it is.

I used to like his music, but his newer stuff is crap. This rarely ever happens; but he has such a shitty personality I actually began to hate the songs of his that I liked. He spits on his fans, pees in mop buckets, gets kicked out of various establishments, writes egotistical bullcrap in Ann Frank's ledger, gets caught drunk driving, has his pals take the fall for his drug abuse, and a heck of a lot more!

I dislike his music and him as a person. He needs to grow up and take responsibility for his childish pathetic behavior.

If I hated him, I'd be wasting my time, so I only dislike him. He's pointless. :)

It seriously depends on which age we're referring to. At the moment hes an absolute ass, though. Hopefully he gets his act together. (Also his music is shitty).
In saying that I believe that under all that rebellion I do believe there's a decent enough person under there