i have one son that is very social. since he could talk he flirted with the women in the grocery store making goo goo eyes. he loves ppl . now my daughter is super shy and would rather ppl just leave her alone. they have there own issues and what works best for them.
my social son did well while we were searching for a new church. he went to one daycare and did well with a couple of chruch nurserys. there was one nursery when he was about 2 that he cried and clinged to us in a very odd manner? not his style at all he loved toys and new friends. after we switched that church he did fine. he just did not like that nursery. it would have been normal behavior for our daughter but not him.
you know your son and the teacher might just not be a great match for him. he might have a hard time adjusting. while it was easy for us to just switch churches its not so easy for you to switch teachers. it might take awhile for you to learn what works best for your son but at the very least your trying. you noted its not working and are willing to try new things different things. try more structure at home in small areas.
we just firgured out when waking our son to count the number of times that i am waking him up. Its working. To get in the car when I ask is also working because I bribed them both with a trip to the candy store!!! :D weird things and what 6 months into the "school" yr were finally getting the hang of things. it takes time and tricks and skills to figure out what works best for each child.
my daughter has a hard time saying "thank you" she suddenly shuts down and becomes overwhelmed with shyness. But she can bump fists. Its a step toward good manners. Were working on it. She was too shy to speak to a family friend (male) and i told her to touch his toe (she was on the floor) and it did the trick she was able to climb all over him and annoy him like any other kid. she just needed her own form of first time contact. Think outside the box, take time to figure out what works best. It also might be very weird for the other ppl as they had a great laugh that he touched his toe then was fine with him. IDK how I knew that it would work but it did.