My advice: Walk away. Turn your attention toward things of worth, not tearing someone apart by seeking revenge by some real or imagined slight.
I want to have a revenge on this guy. But the problem is that he is clever, popular, well liked and smart, so I can't think of a good revenge. Advice?
As Danae said, walk away.
Nothing good will come from it.
Before you embark on a journey of revenge, dig two graves.” ― Confucius