Centrists are seen as fence sitters because they are ok with the horrible things the system has baked into it, as they are comfortable enough to refuse to take a hard stance against it. Right wingers are people who actively destroy things.
I’ve been accused of being centrist, usually by American left wingers, on multiple occasions. I don’t go about defining my political views with a specific side, much less American sides, but if I am indeed an example of someone centrist, then I can safely say your statement is bullshit.
I could explain why, but I’m not sure if I’ll be spending half an hour writing something that nobody is going to read.