Good morning JJ, I hope you have a very good last work day this year ๐
The saying is very old. Back then, the nobles made up their faces and covered their faces with a thick layer of white powder, and as a contrast they made their lips bright red.
Hot coffee is steaming and the steam ran through the make-up of the noble beauties, which looked very ugly then. Therefore, they only drank cold coffee in public. This might be how the saying "cold coffee makes you beautiful" came about.
The nobles in the ancient times had a problem with hot !COFFEEA because it's steam made their faces look !DERANGED ugly, but they found a solution in the !shop of the !MARLIANS : cold !BEER ๐