Everyone who reads comics hates at least one character, and that's okay. Some characters just don't sit well with certain people, and - whether for a good reason or not - they end up having a weird kind of animosity towards the fictional figure. It's one of the things that keeps comics interesting, as personal preference can affect which characters end up coming back time and again, and which are killed off faster than the eye can see.
But some unfortunate comic folk ended up hated by whole swarms of people for reasons that just don't seem that fair. Through one bad writer, one bad introduction, or just missing the point of a character, some heroes and villains get flack for things that actually don't reflect the actual character, and that frankly kind of sucks.
Now, this isn't to say you can't still hate these characters - after all, there'll always be a few comic faces that drive you up the wall. But it's always worth giving them a second chance, too, if only to figure out whether you have a true dislike for them, or if you just caught them in a particular issue or two you weren't fond of.
10. Damian Wayne
The weird thing about the hate for Damian Wayne is that it's all generally for stuff that is explained by just looking at the character - such as him being 'stubborn' and 'childish' because he is, unsurprisingly, a child.
Damian was incredibly flawed when he was first made into Robin, sure, but then he'd also been told since birth that he was going to take over the world, which would give literally anyone a bit of an ego. With previous Robins like Dick Grayson and Tim Drake being fairly emotionally mature, it was refreshing to have a sidekick that Batman had to try and teach to not be so serious, instead of it being the other way around.
With his dad being Batman, it's surreal to think that folks existed who didn't expect Damian to be brooding and often snappy with people - he takes after his dear old dad, after all.