Sad story time...
My brother brought home a young pitbull he found abandoned on the side of a motorway. The most likely theory was that it came from a traveler community and was abandoned because it wasn't good enough at dog fighting. It was still young when we got it, kind of an adolescent.
That dog was nervous around all people, aggressive towards other animals (especially other dogs). But in particular he fucking HATED all teenage boys, probably because of the abuse he had suffered. And guess what I was at that time! Fun times!
I tried hard to befriend him, but he was so psychologically fucked in the head that it was a futile exercise. Every day I'd get home from high school and he would be snarling and bearing its teeth at me and quivering with rage/fear as soon as I walked through the door. I would say hi and he would get even more aggressive, and start following me around. So I took to ignoring him as much as possible. But even then he still attacked me several times. I figured out ways of reducing the damage and fending him off, but it was still not good.
I kept being my parents to get rid of him. Eventually they did, like after two fucking years of going through that miserable routine.
And yeah I did kind of hate that dog because he made my life very difficult. But I also felt really bad for him. He was screwed from birth and so psychologically scarred that he never stood a chance. We're sure the shelter ended up putting him down because he was so aggressive and anti-social.
Fuck animal abusers!