The father, who asked not to be named because his child is still at the school, said he did not raise the issue with teachers at the time because he feared a politically motivated backlash.
He added that he had kept quiet until now because he “did not want my child’s education to be affected in a negative way by the staff”.
The accusations come after Express.co.uk revealed how fellow pupil Joe was grilled by police over his access to the UKIP website.
During an interrogation at the school an officer from a unit usually tasked with stopping students being groomed by Islamic State (ISIS) extremists asked the youngster why he was an “activist” for the party and said it was “not right” that he had clicked on its web page.
Joe’s enraged father Mick told this website he was astounded that teachers had referred his son to the police, adding that the incident raised serious questions about how pupils are being monitored in school.