In that everything not Super-Ultra-Woke is right wing racism this article has some truth.
But what people who spread this kind of crap around are doing (intentionally or not) is normalizing actual racism and reducing the cultural aversion to it.
If an average person - who finds something even slightly less woke like old episodes of the Simpson’s amusing - is damned for laughing at such stereotypes of races and cultures (except uncouth, overweight, stupid, white, American men - it is good and meet that we laugh at that stereotype because it is always true), that person may start to shrug and say: “Okay, if racism is laughing at funny jokes I guess I am racist.” This will mean they will be less likely to react to real racism, because they themselves have been constantly and wrongly accused of it. In fact, they may begin to feel defensive of evil people because they have been forced together with them so often that they become part of a default tribe.
In addition, for someone to take an honest look at our current political landscape and then point to right wing extremism as the clear and present danger takes severe ideological possession.
And as Ron said, use of pop culture to drive extremism has been the almost exclusive realm of the left.