How you've described yourself and people like you... Nothing brings out an evil streak in me more than this type of person. Honestly nothing would give me more pleasure than to give you a go of what you enjoy doing to others and see how long it takes to grind you down.
Clearly you were either spoilt as a kid and never experienced anything to give you sufficient powers of sympathy/empathy or you are learning from example and your parents behaved in this sadistic way maybe putting it down to 'having a laugh' (but it's at other peoples expense so yeah... Doesn't really count = **** humour/isn't funny).
Learn now before someone bites back.