If you wanted the example to be more accurate and like the current US political system, instead of presenting the Democrats as disconnected neutral parties with nothing to gain, they would be akin to vaping corporations and the centrist would tell them both to get fucked

I have to assume leaving Republican out of that paragraph was a typo, otherwise that argument is not centrist at all.

If Republican was meant to be in there then I guess not listening to either political party is fair, but those are your voting options so I don't know how you manage that. Typically when I hear people talk about being a centrist it's in regards to an argument Democrats and Republicans are having, so even if "telling both parties to get fucked" is true for you, it's not true for most "centrists" people encounter.

There's also the fact that compared to the rest of the world Democrats are "slightly right" on the political spectrum and Republicans are "extreme right". So someone close to the center on the political spectrum would be further left than Democrats. When I hear someone say they are a "Centrist" followed by saying "maybe the Republican supporters have a point" it rings hollow.