Don’t be an asshole. Don’t be an asshole physically or verbally. Don’t be an asshole about sex, gender, race, religion, politics, etc. Don’t even be sarcastic, because even though you may not intend it, you might come off as an asshole. Don’t be an asshole to customers. Don’t be an asshole to fellow employees, subordinates, or your managers. Don’t allow harassment from or between customers. Asshole customers can be 86’d. Asshole employees/managers can be fired.
For customer, the rule is, "Try to not be an Asshole."
For the employees and managers, the rule is, "Don't be an Asshole."