Record the teacher saying that truth is relative.

Write nonsense on your exam and defend it has being your truth and that exam answers are relative.

Morality is a matter of opinion, it doesn't exist outside of the people who possess it.

Truth is something that is truly objective, it exists outside of the person and can be independent verified.

There can be "my personal morality" but not "my personal truth", someone who uses the latter phrase is using language irresponsibly by equating perception with reality, either unintentionally in the capacity of not being careful with words and meanings, or intentionally, to give more weight to one's perceptions than it actually deserves though clever manipulation of language.