Precisely. My experience is the same as yours. If a person works for or with bigots, then no amount of "hard work" will lead to their success. Fortunately, that's very often the case any more. But once in the workforce in a decent, well-managed organization the expectations and demands are the same --- colorblind, that is.
One area that still IS problematic: there's a perception it is harder or riskier (discrimination charges, etc) to fire a member of a minority group. That plays out in the selection process in a subtle way. A company's decisions makers (though they would not admit it) may "shy away" from an otherwise qualified minority, and choose a different (also well qualified) candidate that they know they can replace without a big fuss should the performance on the job be substandard.