Antichrist?

I dont know if antichrist is the correct word for this... Well today my teacher said we could talk about what ever we wanted in cl because we had no work to do cause school is almost over... somehow me and my friends started talking about God and the rapture and all that good stuff.. and my teacher states yelling at us for talking about God. He said stuff like You shouldnt be talking about God in public places, and I will not have you talk about God while im around! Is this okay for a teacher to do that?