The word 'Hitler' seems to be a forbidden phrase all over the world.
When I was a high school student, a principal of my high school scolded that a student of the school said 'Heil Hitler!' to a Jewish teacher. Though the principal required the student to leave school, a homeroom teacher in the student's class begged the principal to stop the request.
And, finally, the student was allowed to be on the school, owing to the homeroom teacher's effort.