Kanye West on Alex Jones

[Mister Agenda]

rac·ist

adjective
characterized by or showing prejudice, discrimination, or antagonism against a person or people on the basis of their membership in a particular racial or ethnic group, typically one that is a minority or marginalized.
"we are investigating complaints about racist abuse"
noun
a person who is prejudiced against or antagonistic toward people on the basis of their membership in a particular racial or ethnic group, typically one that is a minority or marginalized.
"he has been targeted by vicious racists online"another.

Note that both the adjective and noun talk about prejudice or antagonism against a group. It isn't 'not knowing everything about a group to such a deep level that you have no misconceptions or over-generalizations about them at all'. Intent matters.