https://www.urbandictionary.com/define.php?term=Generational+Privilege&defid=15102474

a phenomenon that occurs when you have an unbroken chain of ancestors going back several generations, who have never experienced oppression, that prevents you from acknowledging the possibility that oppression may still exist for other social groups besides your own.

Karen doesn't understand why "all lives matter" misses the point, because of her generational privilege.