>A McDonald’s in France costs twice as much where a coffee costs less than half as much.
Source? According to The Economist's big mac index data[1] the price of a big mac in the euro area and the US is within the same ballpark (~10% difference max) regardless of how you measure it. If anything big macs are cheaper in the euro area than in the US. True, France gets lumped in with "euro area", but even if you compare against neighboring countries (eg. Switzerland or Sweden) the difference is nowhere near 2x.
As someone living for 10 years now in the US, and before that 3 decades in the UE: it does seem to me that McDonalds in the US (and most of the fast foods for that matter) tastes worse than in Europe or China (where I've also tried). In'n'Out and proper burger-serving restaurants in the US taste fine, but there's just something wrong with McDonalds, KFC and to lesser extent Burger King, that made me stop eating there.
You really don't want to know that answer, and you really don't want to google that answer. If you do, you might find sites that report McDs is the largest purchaser of cow eyeballs and other less commonly desired parts and pieces. Whether that's being reported by anything in the ballpark of real is up to you. But the jokes have been around for a lot longer than the interweb.
You also don’t need to use a napkin to eat the burger in one of those places.