I think hes referring to the fact that the Euros impose protectionist rules on product names so Champagne can only be made in France and that we have an agreement that only French Champagne can be called Champagne, except Korbel and Cooks, which are American Champagnes and labeled as such, but if it has bubbles, most folks call it Champagne here, so this topic is probably the stupidest example of Trump hate ever seen here and thats saying a lot.
https://cookschampagne.com/