This is the part of message-boarding I have always found lame, insipid, and mediocre -- gossiping about other posters and engaging in guesswork and speculation.
I may or may not agree with her assertions about individual posters being racist.
I never have even received the remotest impression she has considered me or many other white posters here racists.
I agree with her that white racism, the history of white racism, and the enduring consequences of institutional racism implemented and defended by white people is a real thing. It was a real thing in 1920, and it is a real thing in 2018. And plenty of people who deem themselves "not a racist" have either unwittingly, or unintentionally, contributed to the ambient environment that causes institutional racism to endure. It is not enough to holler "I'm not a racist!" -- it is a matter of everyone, myself included, being introspective and honest with ourselves about how we actually get to a society based on true equality.