I park my DS2(nearly 3) in his buggy outside DS1's cassroom in the morning whilst I drop off his packed lunch. A group of DS1's classmates stand directly in front of the buggy and say "Kick" to DS2.
He does and then they all laugh and clutch their privates. DS2 thinks this is hysterical but has resulted in him kicking anything which appears in front of the buggy. I have repeatedly asked nicely for them to stop, but this morning I came out of the classroom to see one of the boys doing it again.
I said in a very firm voice "Please do not teach my son to kick" and the boy shuffled off. The woman who was dropping him off glared at me and muttered "Who do you think you are" as she walked off.
Was IBU? I didn't shout but just used the same firm tone I would in the classroom.