Tell that to a 5 year old child who experiences it...
Why? A 5 year-old couldn't care less what we call it, or whether it's relative or not.
Accepting morality as relative doesn't require anyone to do anything any different than they are right now -- you can believe that morality is relative, and that killing, lying, and extramarital sex is wrong, and be entirely consistent.
You can believe that morality is relative, and pass judgment on others, and be entirely consistent.
You can believe that morality is relative, and advocate the death penalty, and be entirely consistent.