People think that stereotypes are true but also that it is not acceptable to admit this and therefore say they are false. Moreover, they say this to themselves too, in inner speech.
Do you think racial stereotypes are false? Are you sure? I’m not asking if you’re sure whether or not the stereotypes are false, but if you’re sure whether or not you think that they are. That might seem like a strange question. We all know what we think, don’t we?