So here's the problem.
Even if you initially read it that way, at this point, you know that was a misreading, that if we want to put in the most correct English, which no-one here uses, btw, we all (including you and me) don't use perfect English, then it's "Factionalism rather than racialism".
You know that is what the meaning is.
It is not in dispute.
So continuing to dispute is outright bad faith arguing.
I've already given my thoughts on the topic. I don't think factions based on some arbitrary grouping are any better than having the racial descriptions we currently have. It's a game. It's oversimplified. It's not the real world and if we want some core ideas for what someone from a specific race is like it suits it's purpose in the game well enough. If races are literally created by gods, races are the representation of the god's faction. It gives people a core shared understanding that I think is part of what makes D&D work across a broad array of campaign settings.
I disagree with you saying "the words used don't matter because I say they don't". It's akin to someone making an offensive statement an then saying "it was just a joke".
The OP could have easily had a title something like "We should use Factions instead of Race". Then there would be no confusion, no one would look at that and see an implied "I'm right and if you disagree you're a bigot". Word choices matter.