Originally Posted by
ScatterX
Exactly. Offering something to appear generous and then holding a grudge if the person accepts sounds like a pretty crappy thing to do, IMHO.
I agree but you're conflating offers of generosity with idiomatic expressions and general customs that resemble these offers.
If you tell a friend to "make himself at home" while you're away, you would not really expect to come back to a trashed living room and an empty fridge.