I think Mr. Menser's letter is a caracature. Perhaps he grew tired of having his complaints ignored and for that he has my sympathy, but I don't think he's helping his case by fabricating this scenario from scholastic hell. I'm also tired of hearing old white men refer to people who complain (justifiably or not) about white privilege, racists. Reacting to racism is not racism. Racism is when you think your race is superior to another.
If you think Menser's letter was not sincere, then please read the Georgia Chess Association article linked at the end. I included a working link, just click it. No amount of denial or wishful thinking will make the problem disappear. It's getting worse over time. I've experienced it first hand, as has the OP.
um no uscf is for everyone...?