I`m sorry you felt harassed.

Personally, I have no problem with small kids peeing outside. But, I feel there is a difference between peeing in the woods/outside in your own garden and on the playground outside school. ANd I totally understand that a school would like to have rules about kids not peeing outside. What I think is a little wrong, is that they don`t seem to follow that rule up with pottybreaks before going outside, with having a toilet nearby etc.
You said that you counld`t do more than telling him that it`S not ok. I ofcourse haven`t been in your exact situation, so I totally believe you did the best you could

But, what about stopping him BEFORE he starts to go? Does he not tell you that he needs to be? Does he not stand in a place where you can see him starting to pull down his pants?
I hope the school stops lecturing you about this, and starts providing more regular pottybraks before going out instead.

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