Ignore it and walk away.
Make fun of them to your friends.
Quietly hold a grudge, and plan your revenge.
Nobody can hurt me without my permission. – Mahatma Gandhi
It is easier to fight for one’s principles than to live up to them. – Alfred Adler
War means fighting, and fighting means killing. – Nathan Bedford Forrest
It’s not whether you get knocked down, it’s whether you get up. – Vince Lombardi
Here's an interesting quiz for you.