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This is true, I just paid 50 baht at a temple yesterday and my gf didn't have to pay. And of course taxis might try to charge you more too.

But I meant for food the street vendors are incredibly honest. On several occasions I've given them money expecting no change (based on a price on the sign) but for whatever reason the price was different and they called me to give me change as I was walking away

This isn't even that uncommon in Western countries. For example Cardiff Castle has free entry for residents, but non-residents need to pay for entry (at least, that was the case when I was there a few years ago). The museum in my city in the Netherlands is €6 for residents of the city, and €13 for non-residents.

This is also true in many parts of the US (for tax-payer funded places like parks). The distinction is usually based on state (or town) of residence.

It is - many restaurants have two menus, one for locals in thai and one for tourists. Prices in the first one are sometimes twice as cheap. (I've lived on Koh Samui for 3.5 years)