OMG! I'm a BO and I have a 3 1/2 year old. If my child did something like that I would be MORTIFIED! I'm the type of parent when safety is involved, there are no warnings and it goes straight to a spanking. That would've been a spanking! My hypothetical teenage daughters would be grounded as well to make a very strong point!
You handled this better than I would've. I don't screw around with safety. Period. I don't care if you're the president of the freaking United States, if your putting my safety, my horses safety or your safety at risk I'm going to say something. I personally try my best to predict the future when it comes to safety. If I saw a scooter, I would've said "Hey guys, I'm going to be in the wash rack another 5 minutes could you make sure not to ride that in front of him? My horse will flip and I don't want anyone to get hurt".
You didn't see it and you did the right thing by trying to correct the situation as quickly as possible. I would've told all the kids to NOT ride that thing near MY horse ever. I would send their mom an email to let her know what happened. You have every right to be upset. My email would say " I'm not sure if your girls told you or not, but sally rode a scooter at my horse in the wash rack and it really scared my horse and put everyone's safety at risk. I've seen Sally's safety compromised on other occassions as well and wanted to make sure you were aware. I understand that this is your barn/home and you guys should be able to do whatever you like on your property, but I'm not comfortable with scooters being ridden that closely to my horse. Please let me know if this is an activity that will continue to happen at the barn, if that's the case, I will sadly have to make other arrangements for my horse."
~ Starline Stables ~