He or she lives according to his or her own meanings, not God's meaning
or truth. This is relativity.
I think you are using different words than everybody else. Relativity is most commonly used to mean
this whereas what you are describing is more commonly known as
Relativism. You also seem to be using relativity to mean what we would call relatedness. They have similar root meanings, but their specific meanings are quite different - and it might be an idea to use the different words to aid in discriminating between them.