EDIT, TL;DR: If you're successful at something other than sports or entertainment you're not "acting black" because blacks are losers by definition (or so the stereotype says).
> In that case, why do Indians/Chinese "fit a pattern that appeals to them" and Blacks do not?
Because the stereotype of "acting black" is so pervasive and negative.
The black hipster who knows Python and doesn't wear a dew-rag probably needn't worry. Essentially he may be black but he doesn't "act black".
Also, if he's one guy in the startup that's ok -- it fits the pattern. If the whole startup is black, maybe you wonder if they're ghetto. Doesn't fit the pattern because you haven't seen it before.
The bro who shows up with a noticeable accent and stereotypical behaviours is at a disadvantage.
Successful blacks become invisible because they don't "act black" because the old stereotype is that you can't be really black and successful (except in sports, or entertainment).
Someone once said to me: "So these guys were real niggers, you know, not like you -- I mean trash."
On the one hand, I was offended. On the other hand, I knew what he meant.