Here is why Asians tend to succeed:

https://www.pewresearch.org/social-trends/rise-of-asian-americans-2012-analysis/overview/

1) Their CULTURE (which is different from American culture) emphasizes things that tend to increase the chances of success;

2) A lot of them come here as educated adults (H1-B visas) and (proportionally) have twice the population with a bachelor's degree or higher.

In other words, we aren't seeing the full population range of Asians as vice other races and they tend to be starting out in a better position (these days) than the average American, let alone the average American black.

Contrast this with growing up as black in America or Hispanic (especially if you show up in the US as an educated adult with a good job (H1-B visa) and then have the resources to raise children in the traditional Asian home environment.

What shaped the culture of American blacks? And where are they starting out, in comparison? What are the differences in perception (by the majority culture) of each group? It isn't as simple as you want to paint it. As you point out, class (socio-economic status) is also a major factor--but there is just as much implicit bias by working class/low income against the upper class as there is in the opposite direction--the current faux populism of the GoP (and the accompanying performance art) is evidence of that.

I still find it hilarious that so many people think that Trump or his movement are actually populist rather than just grifters.