Didn't read the other responses but wanted to share what my sister, a teachers' trainer, tells her teachers "sticks and stones can break your bones but words can break your soul." while your son is intellectually far superior than his age mates, emotionally he is still a 2.5 year old. He may not fully understand jealousy and sarcasm and may take some of the things this woman says literally. I would remove your child from a situation where he has to interact with this woman and/or let the woman know that her behavior is unacceptable.