Could you try to explain the link to soy milk? When I think of people who order soy milk, I think they are likely to be lactose intolerant, which then I would associate with being less likely to be northern European ancestry, which then I might associate that with likely to be harder working and maybe marginally better developers, so I’d guess the relationship might be opposite to your suggestion.

Full disclosure I’m 100% northern European ancestry, 42.75% English, 37.5% Irish, 6.25% Danish. Plenty of hard working developers with similar ancestry to me, neither the less, the stereotype would be Asian developers are harder working, certainly the bosses often think that, to the point that I’ve observed what I would categorize as pro Asian biases.

Anyway, I’m guessing soy latte ordering is likely positively correlated to developer performance. Not negatively as you suggest.