That comment is 'despicable and downright fucking evil'? Why does everything have to be done at maximum emotional output these days? What about 'Hey, this isn't on, please don't do that'?

As soon as you start insulting someone, they will not internalise any lesson you're trying to make. They may moderate their behaviour out of fear of backlash, but they will shutdown any attempt to listen to the root cause of your problem.