Rule #1- Relatives can't accuse others of wrong doing.
Rule #2- Relativists can't complain about the problem of evil.
Rule #3- Relativists can't place blame or accept praise.
Rule #4- Relativists can't claim that anything is unfair or unjust.
Rule #5- Relativists can't improve their morality.
Rule #6- Relativists can't hold meaningful moral discussions.
Rule #7- Relativists can't promote the obligation of tolerance.
You can check out the article here.
Can you think of anything else a relativist can't do? Share it in the comments!
I also highly recommend the book Koukl co-authored with philosopher Francis Beckwith that deals with relativism entitled Relativism: Feet Firmly Planted in Mid-Air.
Courage and Godspeed,