Friend told me that teacher followed neutral curriculum, but every five 5 minutes there was smugly inside joke about "rape culture" or "white man bad". Kind of like bad standup performance.

Try to bring up something factually correct like: cristian culture in 19th century UK abolished slavery worldwide, and you would get harassed and kicked out of school!

And you do not have to take my word on that, they proudly announce their values on website!