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.
In my experience, if you let a hate group co-opt a term or euphemism, it emboldens them in that usage.
For example, “Oh you did the OK symbol 👌? That’s a white supremacy symbol.” No it isn’t, in most contexts it means OK and in some cultures it represents a butthole.
So by using “master race” for a trivial and humorous concept that a person’s choice of OS makes them superior to others, it belittles its xenophobic usage. A person’s race or skin colour is (or should be) just as irrelevant as OS choice when it comes to their place in society.
You have a very good argument right there, thank you for enriching this discussion!