I find myself concerned about how she speaks to or otherwise treats your son while you aren't present, especially given the difference in how your son interacts with her versus other staff. If she has the audacity to speak that way to him in your presence, I cannot imagine what she may be saying when you aren't there. He's so young (and even if he wasn't) that I cannot imagine enduring what might be termed hostile treatment, at best, is helpful.

Enough said. Just something for you to consider.