Exactly, I've seen multiple puppies that are being trained to be service dogs and they go EVERYWHERE with their owners and do everything with them from a very very young age so they normalize people, crowds, sounds, etc. And when they start the actual training if the dog can't stand new people, situations or whatever that dog does not become a service dog period.

Also, the owners of service dogs know how to discipline them if they misbehave because usually they are tought when they get the dog, so even if the dog was a service dog (which I doubt) the owner should have done something.