I read it as him saying: the argument that "why can’t white people identify as black and say the n-word" is a troll argument, made in bad faith, and is disruptive to work culture and productivity, and people making that argument have no place in their culture.
I arrive at that conclusion because the heading starts "What are they upset about?" They are upset "whether someone can identify as a different race and be allowed to use the N-word." I dont really think someone parading against wokism would in good faith argue that somebody can identify as a different race. They would only do so facetiously. Three tweets above it, his SYN flood DoS analogy makes its pretty clear he is against people derailing good conversation with in bad faith arguments.
As an aside, I'm honestly a little concerned that basically every other commenter arrived at a different conclusion. We are all all over the place. Is our ability to connectively parse tribal language, in a consensual way, really this broken? Is what he wrote really that cryptic or unclear? EDIT: I guess he is the facetious bad actor.