Justin Bieber Sucks! Films, music, TV

I don't thin many people actively dislike him anymore. He is forgotten somehow. He used to be disliked for he wasn't a very pleasing person publicly, but more than all,, he had fangirls who were extremely annoying, just like there are fangirls for BTS nowadays.
I mean there are three people here who said he's stupid or sucks and I would just like to know their reasoning because I don't like it when others put someone down, especially without a proper reason.

I was only talking about reasons which can put someone to hate him. They can be good or bad, but that's understandable.
I appreciate that, thank you.

What's the problem with Justin Bieber? I never really cared about him so I don't know much about him, but I think he's a nice guy. Why do you dislike him so much?
He totally sucks

Dude, she asks you why, don't just tell he sucks. You say that for reasons.

He totally sucks
My question was why you say that, as maito kindly pointed out.