[pbhjpbhj]

Consider that the reason they don't want to use their brains is that they don't seem to work effectively, but they don't want to admit they have some cognitive decline.

Like not wanting to go to a social function because you find them hard, one might say "I'm tired" or offer some other excuse because putting your failing on show is difficult too, the moreso when you're already smarting from a knock-back (being confronted with another failure).