It seems Professor Kevin MacDonald enjoys the leading edge amongst the Dissent Right for pinning the culture of critique upon the Marxist Frankfurt school. But, as detailed in a new book by James Simpson, Who was Karl Marx? which I will not be able to read, being too dirt poor to do that level of research, and not having the time anyway with the frantic pace I have to work at reporting, the finger should be pointed back to old Karl Marx himself. Indeed, most of the present cult of political correctness can be found in embryo form in Marx and Engels. The later neo-Marxists, merely added extra poison to an already toxic brew.
https://www.jihadwatch.org/2021/06/marx-muhammad-and-the-wests-current-crisis