bad example

Evan: "Horns and harmonicas are dirty instruments. That's what I call them."

Eric: "Why do you call them 'dirty instruments'?"

Evan: "You play them with your mouth, and that gets lots of germs on them."

Eric: "Well, they're no dirtier than cups or glasses that you drink out of. You put your mouth on those, too, but you don't call them 'dirty dishes'."

Evan: "Yes you do."

Eric: "Oh yeah."