I gave you some examples but deleted it because I cant actually read people's minds and determine what their motives are.

However if a Jewish media person writes numerous articles complaining about white over represention in something, but never mentions far worse Jewish over representation, then it can be deduced that this person isnt simply exercising self criticism, but has an actual anti white bias and bias in favor of Jews, and cannot be trusted to report on events involving either accurately. It is this clear ethnocentric bias and hypocrisy that results in people ridiculing media and academic Jews for their frequent "fellow white people" criticism.

This is so widespread in the US media that it cannot be taken seriously or trusted anymore when Jewish media overrepresentation is so extreme and collective criticism of Jews completely non existent while collective criticism of whites is continuous.