Maybe you could bust out your awesome geographical knowledge? Explain that Thailand is right between the tropic of cancer and the equator. They are below China, and due to their location, they typically have warmer weather year round.
They definitely don't live in puddles, though. They live in rice patties and flooded areas. IF they live in 'puddles', these are thousand gallon 'puddles' (which don't equate to puddles at that point if you ask me :P).
Putting a betta in a cold environment is like having a polar bear in a hot zoo with only cold water (not a cold, enclosed environment). Sure it lives and can
reproduce, but it doesn't mean that it is happy or healthy doing so.