We don't have that problem as my DS14 never chats with strangers. It takes him a while to warm up to anyone. We still have to push to get him to order his own meal at a restaurant.

Although I do have a few priceless memories of the preschool years. Like the time we were at the zoo looking at the apes, when a family came by and exclaimed how cute the monkeys were. The kid actually piped up that they were apes NOT monkeys because they didn't have tails.