"Racist" is used by progressives as a moral club, a label through which they designation you as an evil, morally depraved person who's arguments can be ignored.

It is purely a rhetorical device, and responding to it in any other way than this is to grant it legitimacy it does not deserve.

That entire video is a waste of time, because progressives literally don't think that way. It is all about moral righteousness, all the time, for everything, and trying to engage with them on their arguments is a categorical error.