Wow, I will admit when I saw the title of the thread, I thought someone was really injured or something. Yes, the man over-reacted (based on what I read) I agree, but we don't know what else may have happened. I am NOT saying the OP or her child did anything wrong, but spray fans in a tight spot -- I can see several people getting wet.
I also agree that "calm down it was an accident" may have been better worded as Sorry, it was an accident.
Just last month, we were at DTD, leaving the
Lego Store. As we were walking by the area where kids play, some kid THREW a Lego creation at DS, hitting him in the back of the head! The kid's mom just laughed!!! No "Sorry", NOTHING other than her finding it amusing. DS was in shock as was I! I stopped, made sure ds was okay (those things can HURT!), and told the mom, "That could have really hurt my son!

" Her reply. Brace yourself: "My son didn't do anything wrong, it was an accident!" Ummmm, really, you accidentally climb on things and toss lego creations at other people passing by? I don't think so. The kicker --- the mom continues VIDEOTAPING the child in his Lego tossing frenzy.

Some people have no respect for others, and let their kids do whatever they please.
I am not saying the OP and her DH were letting their ds spray the guy intentionally, BUT, accident or not, I think the parents should have apologized. I know that both my son and I would have felt better if the mother of the child who beaned ds in the head apologized -- I can say from personal experience, when someone is hurt, "calm down, it was an accident" doesn't cut it. YES, I feel the man over-reacted, but I think he did deserve an apology regardless of how he reacted.