I had exactly same issue before. One of the teacher of my older son was very
indifferent and cold to my son. One morning my son cried and refused to go
to that class any more after staying in the same day care for more than 2
years (but before with other teachers). He cried, but the teacher didn't
even come and comfort him. I was furious and walked out dragging my son
directly to the director. Told her all I knew about that teacher. The
director told me she will take care of it(her). the very next day, the
stupid teacher rasied her faked smily face and greeted both of us. (thank
god she is just a floating teacher, not staying with my son all day long).
but from then on, her faked smile and greetings always show up every morning
.