When is hair contact a contact?

[Back In The Saddle]

It was obviously a generalization, and MCBear has expanded on it appropriately. But here's the two relevant cites from NFHS rules. Other rule sets may be different, I don't know.

NFHS 9-4-1: A contact is any touch of the ball by a player (excluding the player’s loose hair).

NFHS 9-6-7: A net foul occurs while the ball is in play and:
a. A player contacts any part of the net including net cables or net antennas. It is not a foul when a player’s loose hair touches the net, or the force of a ball hit by an opponent pushes the net or net cables into the player.