Chinchilla
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Yes I knowbut in that situation (as described) the horse was spooking and acting defensively, no point in punishing him for it-that would be confusing for him? and hitting previously for kicking wouldn't necessarily stop him from lashing out when spooked would it? colts/bargy/high jinks behaviour needs addressing but as people have said, if you are in the wrong place at the wrong time or trying to punish defensive behaviour then its counter-productive. Handling has to be fair.
Response to behaviour depends so much on context and in the context that resulted in me being booted, a smack was not the right thing to do and therefore wasn't done.