Everybody has the right to get mad but nobody has the right to be cruel

That's right. Everybody has the right to be pissed off, get angry and even be furious when the situation calls for it. If somebody offends or irritates you, you have every right to feel negative about the situation. But you have no right to be cruel. You must not willfully or knowingly cause pain or distress to the offender (nor to the innocent bystanders, for that matter) so that you could just vent your anger. You must not be ruthless just to get some vengeful satisfaction. I know, it is human nature. It is our first instinct. But we should curb that instinct — think before we act. For in a moment of heated passion, we might do or say something we will forever regret.