Why is saying shut up not allowed in elementary school but is allowed in middle school?

When I was in elementary school, if we told someone to shur up we'd be in trouble reguardless of who it was said to. However when I was in middle school the teachers didn't care if we said " shut up" unless we said it to a teacher. To be honest I don't think this should be exceptable... show more When I was in elementary school, if we told someone to shur up we'd be in trouble reguardless of who it was said to. However when I was in middle school the teachers didn't care if we said " shut up" unless we said it to a teacher. To be honest I don't think this should be exceptable regardless but why are kids allowed to say that in middle school but not elementary school?
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