You take him aside and talk to him about his bad behavior and let him know why it's unacceptable. Responding in kind is childish, and only leads to escalation.

You take him aside and talk to him about his bad behavior and let him know why it's unacceptable. Responding in kind is childish, and only leads to escalation. If by "taking the high road" you mean to let it pass, that's also a bad idea, because the behavior will continue and now you'll be morally responsible for not saying anything. However, given that you've referred to him as a "pig", I'd suggest that you give yourself some time to calm down before talking to him. Talks like this go very badly if you don't have any empathy in reserve.