My own kids will sometimes claim that I yelled (when I merely told them no) or that I hurt their feelings (again, for saying no to something).
Have you ever heard this teacher yelling at any of the kids or witnessed abrasive behaviour on her part? If you have real concerns, then just tell the teacher your child was upset and ask the teacher what happened.
You are right to place a big importance on your child liking school. Is your child happy to go to school or does your child get nervous or anxious?
A 1:6 ratio is great.
Are you looking at public, private or either?
Toronto Waldorf School is not exactly private...but it is an independent school. And the kids who attend are usually very passionate about school and learning.
Lol my kids can get all dramatic when I say no too