Opinions on which nationalities are the best and worst tourists seem to vary widely depending on the values of the opinion holder.
Several Japanese I've spoken to suggest the Chinese are bad because they don't queue up at buffets. Some dislike Americans because they're loud and opinionated; others dislike Brits and Aussies because they get drunk and fall down alot (everyone agrees the French are a virus and should find their own planet
). Even tho Germans are generally considered to be among the best, a quick glance at Google gives examples where some believe they are among the worst. I've even met some people who didn't like Japanese tourists because they misunderstood their 'shyness' for being unfriendly.