Dogs&Cats

What i dont get was the beef people had with dogs and cats. Like when i was younger i saw a post on youtube about how dogs were "evil" which made me upset. Same goes for cats too like? I'm a dog person but i also love cats just as much but for some reason this guy at my school says something about cats being weak and useless? And I'm always seeing posts about which is better and which is dumber which makes me mad. Like why can't we just love both of them equally?😒