If you zoom out you can find many more examples. A bit further back, look at the Right's behavior throughout the Bush years - the Dixie Chicks are a perfect example of someone opposing the Right from within their own culture and being summarily "cancelled" for it.

More recently though, Kathy Griffin hasn't recovered from the Trump's severed head controversy.

I'd also like to point out that the type of cancelling and thought suppression the Right does is much more insidious than the Twitter mob, which has the attention span of about a week. The way the Right targets school boards at the local and State level to suppress any curricula which makes them uncomfortable is a huge, widespread problem. Countless teachers in America are legally forced to teach demonstrably false narratives about racism and slavery, as well as to present evolution and Creationism as "equally valid theories."

Comparing a comedian getting cancelled by the Left on Twitter (which rarely sticks; even Louis CK is doing gigs again) with the systematic miseducation of millions of kids based on demonstrably false narratives by the Right, I'd say the latter is much more harmful.