Gill Turner posted: "Lots of kids have total body confidence issues, if a bit of fake tan makes them feel better about themselves then surely this helps with concentration?"
Inevitably, another claimed: "What about a person's human rights... Ridiculous".
The oversubscribed school, which teaches children from 11-18, yesterday defended the ban.
Assistant head Richard Butler said: "Some pupils had gone beyond what was acceptable and we wanted to reinforce our no make-up policy, which includes fake tan. We have had support from parents and there have been no objections lodged."
The school, which was once in special measures, is rated 'good' by Ofsted and received 'outstanding' ratings.