I took my 4 year old DD to a adventure playground with my dh. One of the attractions was a small maze with two entrances and a large tower in the middle so I stood at one end and he stood at the other to keep an eye on her.
There were two older kids at the side nearest my dh who looked to be about 8 who were generally running around having fun.
About 5 minutes later the two children approached their parent who was next to me and said that man over there called me stupid, while pointing at my dh. Kids dad seemed not to fussed and said well you probably were doing something stupid but the other parent looked unimpressed.
I quickly went around to asked dh what happened and he explained that the kids were trying to scale the outside of the tower (which wasn't meant to be climbed on) and DD had asked him what they were doing to and wanted assistance in copying them. He responded "they're being stupid, don't do that" which the kids obviously overheard.
I understand he didn't want DD trying to copy them but I asked if he had to call them stupid and why didn't he say silly or dangerous. DH is of the opinion that they were being stupid so he called them stupid. Upon further questioning DH hoped that, with the children being within earshot that they would reconsider their actions, especially with impressionable young children around.
It obviously didn't come to anything so it's not a big deal but aibu to think husband shouldn't have called them stupid (especially in earshot of the kids).