It's all well and good to point out the hypocrisy on this coming from the right; but that doesn't invalidate the issue. And you're right - it's pretty old, both on the right and the left. Here's a bona fide socialist ranting about leftist groupthink ... in 1943:

"But the same kind of veiled censorship also operates in books and periodicals, as well as in plays, films and radio. At any given moment there is an orthodoxy, a body of ideas which it is assumed that all right-thinking people will accept without question. It is not exactly forbidden to say this, that or the other, but it is ‘not done’ to say it, just as in mid-Victorian times it was ‘not done’ to mention trousers in the presence of a lady. Anyone who challenges the prevailing orthodoxy finds himself silenced with surprising effectiveness."

(https://www.orwellfoundation.com/the-orwell-foundation/orwel...)