I have two sons and currently care for two 2yo dcb's...
This is age appropriate behavior, BUT is not to be tolerated. He is testing his limits and purposely doing the things that get the biggest response from you.
Here they choose to spit if I have somehow "offended", like making it rain so they cannot go outside to play, since they know it is MY "Hot Button".
This would be a discipline issue to me, too, like most PP. Consistent redirection/time-out is what is recommended. Good luck, he sounds like a strong willed little guy. I hope the Parents work with you on a great Disciplinary plan.
