Bugged By Being Pedantic

(I’m a sales associate at a mom-and-pop store. I’m helping a young Amish woman locate the pest control.)

Customer: “I need some insect killer.”

Me: *takes her to pest control, picks up bottle* “This one is a good kind.”

Customer: “Oh, well, this kind is for bugs.”

Me: “Yes?”

Customer: “Well, I need the kind for insects.”

Me: “…”