AIBU this is NOT a moustache

[ChocHotolate]

My son (age 13) has been given a Saturday morning detention for having a moustache (not allowed at his school).
I have attached a pic, I don’t think this is a moustache and certainly not enough to shave.
Interested in what everyone thinks before I challenge the school.

DS had a much stronger tache than that when he was eleven. No school rules about it, though.

I invigilate at a school with a 6th form and a very high % of Indian, Arabian pupils. The boys all seem to have full facial hair from about 12. School rule for it is clean and tidy. Also a lot of very long hair, male and female, again clean and tied back

Saturday morning detention. Yeah I’d like to see them enforce that. He’s not on their time, he’s home with his parents. School can get to fuck!