"Is there a language barrier here?"

Yes, but I'm trying to help you with that.

"I asked if you disagreed about a proposed definition."

No, you did not ask if I disagreed with a proposed definition.

you wrote: "I'm trying to establish that we're using the same definition of "centrist"

without offering a definition or asking any questions.

"Given the sheer amount of policies, anyone would disagree with at least one"

good point.

likely with many.

I wonder how many people disagree with multiple party policies?

hm.

"...if you're still confused what the purpose of that was."

If there is one thing your comments are not, that is confusing.

"Liberals and conservatives are not clubs that you enter and define your viewpoints based off of"

source? any sliver of evidence?

what do people vote more often for?

The policies they comprehensively read and understand, or their party?

"You can even define it more fuzzily"

go for it, define party affiliation as fuzzily as you'd like.

bear in mind that this hazy regulation you're coming up with also necessarily applies to centrism.

"calling centrists out for republican policies may be less accurate than calling republicans out for them"

it is definitively inaccurate.