The word “Master Race” is clearly equivalent to terms which were used by Nazis and so are today’s far right wing and alt-rights.
There are other communities which created similar narratives, especially from the 4chan side, and I think the origin of “PC Master Race” comes from there.
To give a bit of context: there have been similar discussions in the computer science community in recent years. Two examples are the master-slave paradigm in networking and the default git branch which used to be the “master” branch.
I see similar arguments here than in the aforementioned discussions, ranging from “non-issue”, over “language forms reality”, to “respect marginalized groups”.