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That is patently untrue. People drink piss in Berlin too, in fact, Berlin is a major tourist destination. Heineken is produced in The Netherlands and widely available and consumed throughout continental Europe. This idea that Europeans won't serve you something they themselves wouldn't consume, or find repugnant is also not true. But it sounds like a cool anecdote to someone who's never been there and knows absolutely nothing about it. If you're gonna tell that lie again, at least use Budweiser, or Coors light. At least that sticks with the theme of uncultured American faux pas, which is what your story was trying to emulate.

Just in case it's your first time in France : say "bonjour" when entering a store/ restaurant or when passing someone in an elevator or a staircase. Say "s'il vous plaît" and "merci" every time you ask for or get something respectively. This will save you a lot of nasty stares and displeased reactions. Actually that's one of the reasons French people have a mean / rude reputation...we are VERY keen on politeness and when someone fails to respect these basic rules, we consider them rude and act rude in return (this analysis is not mine, it's from a foreigner who lived in France for several years but, as a native french, I think it makes a lot of sense to explain the french mindset)