Is he flirting when he teases me or being mean?

You often read how teasing is a form of flirting, a bit like pulling a girls pigtails when you were at school.

For men that perhaps haven't matured or gained as much experience with the opposite sex, how can you tell when they're trying to flirt by teasing you or when they're just being mean?
Is he flirting when he teases me or being mean?
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