Posted By:
MisunderestimatedIf I think the person is merely ignorant and really wants the card I might take the time to explain why the offer is way off base.
If I believe that they are intentionally trying to "cheat me" or annoy me I would be very very curt-- "No thanks."
I wouldn't be insulted in either case -- I think irritated or annoyed better captures my feelings or even surprised if the offeror was someone I had thought better of.