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The same type of thing happened to my boyfriend- he visits Thailand quite often since he moved to America a couple years ago, and one trip him and his friends (not all of them were Thai) went shopping. When they were buying something, the seller and his coworker were discussing together in Thai how much they should charge him for the item (since him and a his friends obviously looked a little different from the other 20-something yr olds there)...after a minute my boyfriend got kind of impatient and just came out as politely as possible in Thai, something to the extent of "I know what you are saying- I do understand Thai".
They ended up giving him the Thai price....


visionchaser makes a great point- they may see it as a tourist being able to afford the higher price...but I can see how that would anger a Thai person visiting their own country, despite the kind of crowd they bring with them.