Lots of patrons get insulted when offered a large print book.
(Even if the regular print is out. It's bizarre. I guess it's somewhat similar to being insulted by NOT getting carding when buying alcohol. Or something.)
Anyway, if they get huffy, I tell them that lots of people like to bring large print books to the gym with them. It never fails, because then THEY THINK that I THINK that they go to the gym regularly and they love me again.