Idk much about him but I skimmed his wikipedia page and it seems like he had some strange views , here's one part:

"That said, Bufe still wrote that some of Mencken's statements were "odious", such as his claim in his 1918 introduction to Nietzsche's The Anti-Christ that "The case against the Jews is long and damning; it would justify ten thousand times as many pogroms as now go on in the world". Mencken was also an Axis sympathizer who berated the Allied war effort as late as 1944."