As far as I know true coffee fans don't acknowledge instant coffee. I'm not sure that I heard of it but I think the same refers to various coffee drinks (кофейные напитки) that were quite common in Soviet shops (at least during a certain period). And instant coffee is consumed all over the world so I don't see why Americans should be accused of consuming “improper coffee” more than others. Sorry, friends, but my impression is that it's just another attempt to "show" that "simple-minded Americans" are inferior to “refined and complicated Europeans”.
Btw, those who were acquainted with “Essential English” by C.E. Eckersley could have come to a conclusion that foreigners dislike English coffee .
As for demitasse, it can't be half gallon by definition:
http://www.bartleby.com/61/28/D0122800.html