Who's doing that? Links to complaints, if you can.
I belong to the body of Christ, the Bride of Christ, of whom I am a member by being born again through faith in Jesus.
Catholics are singularly incapable of wrapping their minds around the concept that THE church, the body of Christ, is NOT a denomination or building. That is an organism, not an organization.
FWIW, I don't belong to a "church", I belong to Jesus. I am willing to attend any local assembly of believers whose statement of faith attests to salvation by grace through faith in Jesus, not of works.
I could even attend a Catholic church, if they started teaching what the scripture teaches...
‘FWIW, I don’t belong to a “church”,’
Quel surprise.