[Adam]

I'm going to assume that the foul was intentional, because I've seen it before and arguing that point isn't really important to me here.
Coach, I think you did fine. Your comment was more in line with showing your kids you had their back. As a ref, if I'd passed on the intentional here, I would have let you have a gripe. I may well have had my reasons for passing on the X, but I'd fully understand why a coach would challenge my judgment there.
If you would continue, then I may have to ask you to stop. However, it sounds as if you only made the one comment. Frankly, I'm giving some leeway here.

Also, good job on teaching the kids. It sounds as if they handled themselves pretty well here. It's up to teammates half the time to calm each other down. #5 may have felt he was being ridiculed, I don't know, but the laughter may not have helped him at the time. Your #4 deserves a pat on the back for stepping up.