Umm... I'd be looking elsewhere. With yelling, kids are usually scared of the yelling at first, and then they are either fearful of that person or just begin to ignore it, which is equally ineffective.
Having worked in daycares before I set out on my own (I've had two preschools and have worked as a nanny)... some sweet directors are very ineffective at getting good staffing in.
I reserve yelling for Big Deal stuff, not everyday misbehavior. For example, had the boy who was walking away been walking into the street--perfectly legit reason for yelling constructively "Connor. Come back! The street is dangerous!" (nothing to do with his person,no insults) .
The comment she made to YOU regarding the child/ren was very unprofessional.
Most good teachers will tell you that in most cases, talking in a quieter voice better gets their attention. With my toddler and preschool groups, when the room got too loud, I'd turn off the overhead lights so we could still see, but it wasn't so bright. This gets their attention. What you described sounds, to me, like a lack of group/classroom management skills.
Moreover, what sort of example does it set for the kids if the teachers are yelling? WE are supposed to be the models. Great teachers will call all of the kids in from outdoors play with a group song or chant. They use these more nuanced, embedded ways to signal transitions precisely because it is different than speaking in a usual fashion. We sing our way to morning gathering, we sing our way to washing our hands, changing diapers, snacktime, in from outdoors, etc. Perhaps this would seem idealistic to some parents, but really, I've used this method and my son's preschool teachers did too, and it works beautifully while keeping the atmosphere calm and contained.
Please look elsewhere for daycare services. And when you go, specifically ask if you can come and observe the program before you have your child enrolled. Good programs will not have a problem with you coming to observe before you sign up.-- they might have certain times of day which work best because they are not heavy *transition* times for the kids (during those transition times you are usually seeing a little more chaos AND are a distraction for the kids). Good luck!