in my opinion, each race has their own characteristic in their general population. So of course there are hardowrking other races but generally other races are a bit more relaxed.
I believe its not really about the gene. But more about a teaching that is too old n too widely applied so its hard to change. You can be the not so hardworking chinese but there are milions other chinese people that are hardworking that automatically will make you not preferred.

Its kind of like chinese also believe in the chinese zodiac (ox, dog, snake etc) its not from their gene. just a historical and cultural value that is too old n too deep rooted. Too many ppl believe in it that its pretty hard to stop believe in it. I myself don't believe in any of that astrology but so many other chinese ppl will tell me "its true". luckily i see growing number of ppl stop believing in chinese zodiac so the deep rooted tradition is slowly fading away. Maybe in the future if everyone starts doing it, the Chinese people can be more relaxed.

each ancestor is different. so each race will have some belief/ tradition that is too deeply rooted that its hard to stop doing it nowadays.