It wasn't an argument, it was just a tongue-in-cheek response to CodeToad's post about adult childen picking their parents' nursing home.
I've actually made tongue-in-cheek comments to my father in law something similar to that. I told him he better be nicer to my sister-in-law (my husband's sister) than he is to me or he'll end up in a nursing home with ugly nurses and liquid-nitrogen bedpans.