> I think the most contentious point is that "prejudice without power" has become a socially acceptable phenomenon while a decade or two ago people were campaigning for no prejudice of any kind.

That's really insightful point! To my ear, condemning someone for engaging in "prejudice" has far less sting than condemning them for engaging in one of the "prejudicial isms" (like racism or sexism). The extra sting comes from the widespread and deep understanding that those isms refer to totally unacceptable behaviors.

I only see the "prejudice + power" definition of racism come up in defense of racially prejudiced comments. The effect is to (relatively) sanction and normalize forms of racial prejudice. Personally, I find that to be a totally unacceptable effect.