My son is 9 years old. I would describe him as emotionally immature for his age.
He gets upset easier than other kids and tends to pout when he is especially upset about not getting his way. I do not cater to this or comfort him, but I do sometimes get mad. I realize that pouting will go away on its own if it gets ignored (something I'm working on). But what really gets to me is when he tries to create physical distance.
Here's an example - We're sitting at a parade and he and his sister get into an argument. I tell him to stop what he's doing and then out comes the lip and the smooshed up eyebrows. I could handle ignoring that if that's all that it was. But he has to take it further by moving his chair far away from everyone, despite me telling him to leave his chair where it is. He also accomplishes this distance gain by walking at snail pace and dragging his feet, and sometimes even crawling on the floor, again super slow.
Do I treat this all the same and ignore it altogether? What do I do when he's about to make me late, etc. because I have to wait for him to slowly crawl to the door, slowly put his shoes on, and finally stand up to leave? It drives me MAD!