this reminds me of a saying: "On the trace regardless of the heart, on the heart of the world's few perfect people" from the Qing Dynasty Confucian popular book 围炉夜话. translate to "Around the Furnace Night Talk", meaning that the external behavior performance as the basis for evaluating others, without the need to explore their inner true thoughts, otherwise there is no perfect person in the world

I think the reason why this twitter post went viral was because racism is such a sensitive topic and it often attract a lot of attention, people talk about it, comments about it, argue against each other, also jokes about it, this allows more and more people retweet about it, include celebrities, lead this post become viral.