Which people, pray tell, say the Japanese lack creativity? I've certainly never heard anyone say that.
I've heard it a hundred times, but then I'm from a UAW town (Flint, MI). Not just a UAW town, an entire UAW region, spanning from Ohio to Bay City, Michigan along the I-75 corridor.
Denigrating or marginalizing the Japanese has been around since WWII (probably before if you count "orientals" in general), but started to fade not too long after the war ended. It received something of a revival during the 70s and 80s, in response to the increase in Japanese imports that began to compete directly with categories of goods that American companies had once dominated; electronics, computer components, motorcycles, ATVs, etc. Anti-Japanese sentiment was particularly strong (and inflammatory) among the unionized manufacturing sectors (which included the motorcycle companies, commercial equipment, lawn mowers, generators, basically anything with an engine) who saw Japanese imports as a threat to their union hegemony, high-paying jobs with only a high school diploma (or not even that).
I STILL see it (once in a while) in comments from some friends and family I've reconnected with on Facebook.