Most of these cretins are leftists, and they don’t try hard to hide it.
However, there are/were a few “conservatives” that fall into this bucket. The biggest was probably Joseph Sobran. Indeed, Buckley fired him from NR over Sobran’s slipped mask. Buckley also penned a massive/40,000-word article In Search of Anti-Semitism where he basically called Pat Buchanan an anti-Semite.
This masquerade rears its head every now and then on FR, but it’s usually called out quickly.
This is also comparable to gun controllers SWEARING they support the 2nd Amendment.