You've made 3 comments in the thread saying "he didn't make the cut". Read the article please. He didn't make the cut because he was an Indian male. The professor didn't even discuss anything else - his grades, or his previous internships or his research interests.

Even the excuse she gave afterwards didn't say he lacked anything, just that she didn't have space in her lab.

Research labs have limited space, therefore they select candidates similarly to any job.

I can't imagine anyone here would have the same response if a startup were hiring two Senior Developers, considered many candidates and then got hate mail from some guy claiming that the ONLY reason he wasn't selected was because of his race.

You missed the fact that those emails are from the actual professor who rejected him? This must be the forth time I tell you to read the article. Don't do any speed-reading bullshit, take your time and read every word and screenshot. Slowly.