17 Things Americans Do That Are Considered Rude Elsewhere Photo credit: CC license by Ben Sutherland 7. Luxembourg, Switzerland, France, and Singapore Chewing gum in public is a big no-no in these places, it is considered a vulgar and highly unattractive habit. In Singapore it is actually mostly illegal since workers got so tired of scraping it off their city streets. Prev7 of 19Next From Around The Web Facebook Comments comments