Hundreds of Muslim parents and their children – dressed up as superheroes – protested outside a primary school in Britain on Thursday against planned lessons on LGBT rights.

More than 200 protesters organized the demonstration against Parkfield Community School in Birmingham over the school program called “No Outsiders” that includes teachings about homosexuality, including same-sex relationships and marriages, and challenges homophobia.

The organizers accused assistant head Andrew Moffatt, who is gay, of promoting LGBT rights against the wishes of the parents, who carried placards reading “Say no to sexualizing children” and “respect and be respected.”