Our results show that women’s contributions tend to be accepted more often than men’s [when their gender is hidden]. However, when a woman’s gender is identifiable, they are rejected more often. Our results suggest that although women on GitHub may be more competent overall, bias against them exists nonetheless.
That’s not an excellent example. If they refuse to collaborate with them, and also don’t make any claims about the quality of code, then the claim that their objectivity in reviewing code is tainted doesn’t hold.
Their objectivity is preempted by a subjective evaluation, just like it would be by someone’s appearance or any other perception other than the code itself.