I disagree that Conservatives treat Democrats this badly. Democrats are the ones who literally invented `Cancel Culture`. Never in history have the two parties been more different.
(Wikipedia suggests the term itself originates from black communities, which is not synonymous with Democrats. I think it's fair to assert the practice without the name is much older).
My point is I don't know how we differentiate between "Cancel culture" and "shunning" or "boycotts."
The Dixie Chicks had their career derailed with only a nascent Internet in existence. It was never necessary for people to organize and decide collectively something needed to be shunned.