J.P.
Hi there,
I used to work as an Infant & Toddler Specialist prior to staying home with my daughter after she was born, and I went in to child care settings quite a bit. Take a look at the environment in your child's care setting - what does the caregiver do? Does he/she respond in a caring yet disciplining way or does he/she shame him? What was going on prior to the pushing episode? Does the caregiver sit back and observe the environment every so often? Does he/she take anecdotal observation notes, marking your child's developmental progress, situations when he's pushing, etc? What kind of curriculum does your caregiver have so your son doesn't get bored?
Just a few things to look for. Often pushing is a learned behavior that your son has figured out will get him his way in a certain situation/environment. Often for children zero to three, the environment in general is the biggest cause for misbehavior.
Hope this helps!
Smiles,
J. P