Treat people like shit, that way they treat you like shit. Don't expect them to treat you like shit though, some people try to be friendly to try and get you to be friendly to them.
An asshole's golden rule is not the same as a friendly person's golden rule.
When your child askes you about the golden rule you could say "do onto others as you would want them to do onto you." or you could say "He who has the gold, makes the rules"