I think it is just him trying to be edgy, or thinking communism = free stuff. He harangues workers rather than support their rights at work, and he has no understanding of dialectical materialism, or else he wouldn't say he's a woman based on nothing but his own claims and in clear conflict with material reality. That's a postmodernist thing, not a communist thing.
Though I guess if he "identifies as" a communist the same way he "identifies as" a woman, we can't expect him to actually follow any communist thought, words mean whatever he says they mean and he's a communist because he says so.
The very fact that he said "the N word" rather than say "nigger" should clue him in to it being much worse than "sir".
If you can't pull out saying "nigger" outright, then the word isn't as bad.
Also why does everyone want to try to instantly raise something they don't like to nigger status? Don't they realize nigger being so bad took generations of use and systematic use as an insult to get to where it is? "Nigger" is more than the word. It's the idea it represents. An idea that blacks are less than human. That they aren't people.
"Sir", however, is a term of impersonal respectful address towards a man. Ma'am is the same for women. We don't have a gender neutral term that carries a sense of
impersonal but overt respect like sir/ma'am does. It isn't an honorific like Miss, mister or missus, which goes before a name and therefore signifies familiarity and a personalized address, so we can't slip in an x and call it a day because it's filling in for an unknown variable.
Everyone expects such a personal touch that they forget certain terms existed for the impersonal while remaining polite and respectful. Not using such terms would be a sign of rudeness and disrespect traditionally. As sir/ma'am imply you are speaking to someone being placed equal to or above oneself in society. Excluding it implies they are below you and/or unworthy of respect. Failing to show respect in the wrong circumstance can get you in a lot of trouble.
Naturally the backhanded sir/ma'am exists. As in saying "of course I'll get you another glass of water after you spilled that one all over me,
sir." Instead of calling them an asshole directly, but that's because being overly polite for a given situation is a way to show disrespect and mockery.
Compare that history to that of calling blacks "niggers".
Mind you, I doubt this troon has ever been in a situation where they had to address someone with respect outside of sexual kink roleplay, so the meaning is lost on him.