If people aren't using it anymore it's not necessarily because it's considered racist, (perhaps irrelevant, though) ; more likely because people are just not aware of such expressions anymore. If an expression like that is not used in video games, by news media or on social media, chances are most people don't know what the hell it means. People don't really read books anymore and that
used to be the most likely source for knowing about these types of expressions, unless your parents used them when you were growing up.Generally, it appears that a lot of these colloquialisms and expressions are becoming increasingly obsolete, just as on the physical level
more and more animal species are disappearing from this planet. Call it "linguistic extinction", maybe.