(This is not an opinion that I agree with, but a lot of people actually think that way).
Sarcasm aside, a lot of people believe whatever serves them better. When they realised that "racism = discrimination" wan't enough to let them achieve their goals, they changed the definition to "racism = discrimination + power". Or, us geeks only became "patriarchal opressors of minorities" when non-geeks realized that the smart kids that got bullied at school were becoming really rich.
I have found a near perfect antidote: I point out that the USA is the world's most powerful nation (I'm from a small weak nation that has historically been trashed a lot). So, I continue: are you saying that only Americans can be racist, for they are so powerful?
Nobody that I threw that at has been able to recover, they stutter, stumble, flail their arms, start to sweat and change the subject.
That's a really good point.
There's this idea in the world of "white guilt" - that white people have been exceptionally cruel, by enslaving, killing, colonizing other races/nations.
The reality is that most people/races were viciously cruel; people fought wars, killed/raped their opponents, enslaved their prisoners, ... for generations. The difference is simply that whites (Europeans) have been so much more efficient at it (as with so many other things), because they were the first to develop advanced technology.
Well, it's a "rhetorical technique" then that appears to have gripped mainstream discussion on the matter. It's why blatant double-standards are accepted when it comes to the topics of race, sexism and equality. Either that, or it's the whole "outrage culture" that's causing me to see way more of the blatant outrage rather than the reasoned discussion.
On the other hand, I'm pretty sure that Twitter would explode if a black candidate was denied for "speaking black" (personally, I find it hard to understand non-mainstream dialects of English). Although tecnically, that still wouldn't be racism, but rather just generic discrimination.
While I understand the critique, I disagree with the academic terminology, and think insisting on it leads to misinformed intepretations of others' arguments, like saying "black people by definition can't be racist".
I don't think they consider those things racist though, so that can't be their definition.