From the standpoint of simple manners, which is worse?
a) The person who never says "thank you" for courtesies shown, favors granted, or efforts expended
b) The person who routinely solicits/demands expressions of gratitude from others for every courtesy, favor, or effort.
I suppose there could be a third category for people who do both a) and b), but that would make it too easy.
Which is most irritating/least defensible?