Maybe you could look it up instead of dismissing it out of hand
https://en.wikipedia.org/wiki/Whiteness_theory
Feel free to disagree afterwards, but the words do have meaning. And not knowing them is not an argument against it.
"Ending whiteness" does not mean "killing all white people" or "eradicating all European cultures" or whatever the parent comment was implying. (Or am I reading too much into it?) Though perhaps you can find some moron calling for that on Twitter.
Or do you mean that sociologists who speak about "abolishing whiteness" secretly mean "abolishing the behavior and identity of white people"? No I wouldn't agree with that. I think they mean what they say, and when they tell you their definition of "whiteness", that's what they're referring to. Not some other thing.