Treat him like dirt.
More Traditional Proverbs:
A wise man may look ridiculous in the company of foolsTraditional
Love is a many splintered thing.
Traditional
Dip your tongue in wisdom, then give counsel
Traditional
A dry cough is the trumpeter of death
Traditional
Add one small bit to the truth and you inevitably subtract from it.
Traditional
If you have to kill a snake, kill it once and for all
Traditional