Nonsense.
When in Rome or England or the USA - do as the Romans or English or Americans do. When I'm oversees I always do my best to follow the country I'm in way's of doing things. Then I'm much less likely to be either the ugly, or the foolish, American.
I also find that people in other countries appreciate the effort of trying to do what is right in that country, even if I don't always get it exactly right. It has served me well on more than one occasion and has made my time oversees much more rewarding and safe, in ways that have nothing to do with money.