But still, does being a huge H.L. Mencken fan make me a racist?

I think that, in terms of the odious Southern Law Poverty Center, alas, it does.  I could explain, and explain, that I personally refuse to judge anybody on the basis of such externals as skin color or the size of his buttocks (unless she's a Kardashian); that my loathing of, specifically, the Black, Jewish, Irish-American, and Southern Poor White Trash (including Appalachian and Ozarkian Hillbilly) Cultures does not extend to anyone who is actually in those cultures; that I am resolutely fair-minded and deliberately color blind.  True, I really, really hate their music, and I am disgusted by their high opinion of themselves, and appalled by what they think is funny--and I would rather die than sit through a performance of Fiddler on the Roof--but that does not mean that I hate them, or wish them ill, or would object to a child of mine (if I had a child) marrying one of them (Although I might commit violence to prevent a grandchild of mine from being circumcised).  Even so, you see, I am pretty careful, while freely denigrating and despising whole Cultures, not to extend my put-down to the Ethnic Groups which unfortunately actually produced those Cultures.   And I realize that Mencken was not so careful.  But be it said, that having negative opinions about ethnic groups is as nothing compared to the wickedness of being prepared to do them injury, and of this Mencken cannot be accused:  He denounced lynching and the Ku Klux Klan, and he proposed to allow the Jews being persecuted in Germany and elsewhere in Europe to emigrate to America and Canada; which, had the immigration authorities of those countries permitted it, might effectively have forestalled the Holocaust.