Try out some places in northern New England or Rhode Island. Still fairly popular there.

Names change, as do tastes. So it's not that they don't have an idea what you want, they just don't call it that any more. It's like ordering a Frappe. Nobody calls them Frappes anymore. Then try ordering a black and white Frappe, and they get totally confused.

Culture has a big deal with it, too. When I worked in Boston I would frequent an Au Bon Pain where most of their help was Brazillian. They honestly did not understand teh idea of toasting bread - so when you ordered a bagel tosted it took them a while to figure out how to properly toast one - and they had no idea why you would want to do such a thing!