There seems to be a recursive aspect to this. Accusations of racism are used to silence (censor) voices.

From the article:

Charges of “racism,” for instance, are primarily deployed against the political opponents of upwardly-mobile, highly-educated progressive white people. Even to the point of branding prominent black or brown dissenters as race-traitors (despite the reality that, on average, blacks and Hispanics tend to be significantly more socially conservative and religious than whites).