Aside from minority candidates having a more grounded perspective on issues concerning their own minority groups than non-minority candidates, I think the real frustration is in knowing that all of the white guys rising to the top of the polls is not because they coincidentally happen to be the best candidates for the job, and I say this as a Bernie supporter but also a minority. It is disappointing to see the minority candidates having to cede the top of the field to a bunch of white guys, so no, I don't think people need to stop complaining about that, nor do we need to stop talking about identity politics because they do matter.
I understand where you are coming from, but the post I quoted was more with the dismissal of someone rather than minority candidates having to cede the nomination to a bunch or particular white guy. That said, the 3 (or 4 if you count Mayor Pete) big name minority candidates have all made some pretty big strides with the exception of Booker. Harris, Buttigieg, Warren have all surged, where as most of the typical white candidates can't even be named, and rock stars like Beto have sunk like rocks.
The real disapointment I think is people like Biden and Bernie to an extent, who are old white men who just don't want to clear the field for new people, of minority status or not, to take office. I say this as someone who backed and volunteered with the Bernie campaign back in 16. I would honestly love if neither of them ran this time around. They bring nothing new to the table, and while I love what Bernie has done, what is he bringing up now that he didn't before. I understand the full frustration with people just scrambling to one of those 2 because they are "comfortable" to the general Democrats.
While I am in full agreement people of minority groups are the best people to tackle issues that effect said groups, what I was getting at wasn't that people need to stop complaining or ignore identity politics, but rather that the vitriol for another one of these white men is uncalled for. People can say their pieces about them with legit concerns, criticism and complaints without sneering while knowing nothing about them.