@Tikibo
Pretty sure the kid's autistic. So arbitrary "heavier punishment" for a kid who already doesn't understand many things, like why he shouldn't throw food around, or why he shouldn't take off his clothes around the house, will not lead to him understanding that "bad things = punishment, worse things = worse punishment". He doesn't understand that link.
Kids don't think like adults, weighing risk vs reward. Autistic kids have it even harder.