The former for refusing to buy into their antisemitism,
Yeah, he just calls it 'Cultural Marxism' instead.
Six or seven years ago when use of the term was confined to basement dregs, this claim might have held water, but it has since entered mainstream terminology on the right while stripping itself of the old baggage and implications with respect to those using it, except among those who see everything as a dog whistle.
Go ahead and elaborate what "cultural Marxism" means
It's a continuation of Nazi propaganda.
That's the baggage I was referring to, though the Nazis did not use the phrase "cultural marixsm" itself, but rather "cultural bolshevism," but I'm needlessly splitting hairs.
Nowadays "cultural marxism" a reference to the application of conflict theory (which originated in Marxist thought) to the cultural realm. Regardless of whether or not you believe the theory itself is valid, it has become quite visibly pervasive in every kind of relation in modern society - between cultures, ethnicities, sexes, sexual orientations, gender identities, and even generations.
Critics of this trend and those who proliferate it refer to this ideological phenomenon with the umbrella term "cultural marxism."
The fundamental difference between its use by Nazis and its use by opponents of conflict theory today is that the former used it to refer to anything they didn't like in society, whereas the modern use has a clear and quite accurate definition that is as applicable to the identitarian left (see: "SJWs") as it is to the identitarian right (see: the post-2016 alt-right).
All of those "conflicts" were built into America in its foundation and that was noted, which predates any Marxist thought so I'm not sure why Marx is tied to this. And I disagree with your second point as Peterson and the like clearly know this, yet label any critiques of the U.S. as such. It doesn't even make sense as Marxists and so called sjws rebuke each other every chance they get.
The conflict theory, suggested by Karl Marx, claims society is in a state of perpetual conflict because of competition for limited resources. It holds that social order is maintained by domination and power, rather than consensus and conformity.
SJWs and Communists, despite having common ideological roots, are perennially at odds because Communists maintain focus on the class struggle, and believe identity takes a backseat to economic class.
Conflict may have been baked into the United States since its founding, especially economic and ethnic, but the weaponization of conflict along every possible line is a comparatively recent phenomenon. ---