An experienced preschool teacher put it this way re socialisation at this age with peers at this age...
"imagine putting a child in a chicken pen and expecting them to play with the chickens. They try to line them up and play games which the chickens can't/won't, they work out which chickens will peck them so avoid those ones. When the chicken feeder comes (teacher) they desperately try to have a conversation before they are the pushed back into the chicken pen..."