I don't really get either side of this thread, tbh.
On the one hand, I imagine a young swimming instructor reaching over with a float and jovially tapping a kid. Not something I'd imagine many kids would be upset about - or even humiliated or embarrassed.
On the other hand, I can also imagine a teacher being quite vicious/bit bullying and being physically aggressive using the float to jab at the boy(which I'm sure is possible, as words don't leave a mark either).
It all depends on context. Scenario A, the boy needs to be told not to take things seriously. Scenario B, the instructor needs to be told to take it easy in future. I think there's no real evidence in this thread to conclude which is more likely - we have no info about the boy, how he normally gets on with others, how serious or social he is and nor do we have information about the event.
There's Scenario C - the possibility that the kid misread the situation and thought that she was intending to be more aggressive than she was, and there's learning to be had in that too. I don't think kids' concerns about this kind of thing should be met with a "man up" attitude - it should be talked about with respect for the individual kid's feelings and a desire to know the whole story. If it emerges in the conversation that it's a bit of a mountain out of a molehill, well, that can be explained and discussed. I dislike the use of macho language here - man up, wimps, wusses etc. He felt upset, he communicated that. You can do and should be able to do at 8 that without being mocked. A lot of things are still new - they will be at 14, at 18, at 22. It doesn't mean that feelings need to lead to mummy sorting the big bad lady out and it might be that he needs some feedback about how to act in those situations.
God, the 11 year olds in my secondary are still little babies (though they pretend to e streetwise
). I think it's reasonable for an 8 year old to not really "get" how to act in this situation which was, essentially, a new experience and one that just didn't make a lot of sense.