You could try reading the link I shared.
“This last sentence pinpoints one reason for Mencken’s popularity among the black intellectuals of the 1920s. He seemed to know what they knew, that beneath the smug surface of American life was a core of rottenness. Like the child in the famous fairy tale, Mencken saw Uncle Sam without any clothes on, and he did not hesitate to laugh. His satire of southern culture (at a time when the South still reveled in its romantic myths), his identification with the literature of realism and rebellion — these facets of Mencken’s public and literary personality had a specific influence on the black intellectuals, but what they liked about Mencken generally was his personal courage.”
“Several times Mr. Mencken has written on the race question, and although he has no special interest in the *****’s rights and wrongs, he always writes on the *****’s side, because he sees that on that side lies the truth.”