I’m sorry your having to deal with that. Is he seeing a pysch that is familiar with aspies? Perhaps they could help weed out the source of it and give you a game plan to help wean him off of it. Does he like goals and or working toward stuff? My son hates chores and this is how we got him to actually do some, he works toward something he really wants by doing what he needs to around the house. (it isn’t 100% obviously, but I’ll take 50% over nothing) Maybe you could find something like that to try?
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I hate hearing, "you don't seem autistic/aspie". I have a nagging suspicion most people have no idea what autistic or aspie "seem" like in the first place...