If you were at a beach and you had on flip flops and an old guy (70 or so) decided to give you a compliment and say nice thongs, what would you do?

would you consider his age and assume he meant flip flops (in the 60s, thongs were widely known as flip-flops (and not underwear))

If you were at a beach and you had on flip flops and an old guy (70 or so) decided to give you a compliment and say nice thongs, what would you do?
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