DCC isn't something that affects only US cards. It affects a UK issued card in Ireland or euro area issued card in Poland or HK issued card in China. I have no problem with people paying dearly for their ignorance. If you don't know what the EUR/USD exchange rate is and get duped into accepting DCC plus use your 3% FTF card, it's your own fault. Getting shortchanged in a taxi? Again, it's not limited to Americans, but it is your own fault.

Nobody likes to feel cheated, even if the person allowed himself to get cheated. Creating a similar mentality for the naive travelers will go a long way to help our cause. I've educated a few people in this category asking how they felt paying a total of 5-8% more for their items when using a card than I did (FTF + DCC). I then educate them on which 0% FTF cards are available and then how to avoid DCC. People aren't mad about the small amount, but they're upset because they feel like the merchant pulled a fast one on them.

In the future you better believe they'll be hypervigilant about making sure they're charged in local currency just like you now make sure you get proper change or that the meter is displaying the correct tariff.