AD, I know you wrote about your H's, questionable behaviour in this forum because it is safe. I will not judge your H but what he could very well feel is benign behaviour.
The biggest question to ask him... or your son's... is if he would be willing to tell people about this type of horse play in a public forum.
If he would be ashamed or unwilling to do so, then he understands that it is unlikely socially acceptable.
