The Thumb of one race is an internet meme coined by PewDiePie on november 7th 2019.
In his video, he postulate that anything can become a hate symbol if used by ill-intentioned people. He also advances that it is the medias or the outrage culture in general that sparks the use of those symbols in a negative way, not the symbols themselves.

Later in the video, he gives the audience a thumbs up when concluding his essay and then says: Oh no, the thumb of one race, oh god. And he starts laughing.