Earlier quoted context omitted.
Insulting and demeaning racial groups is the opposite of inclusion. It breeds resentment and hatred. For a time there was a focus on treating people as human and not as [racial/sex/religion] Trend these days is to encourage openly being a bigot, just as long as it’s against certain people. Replace the word white with any other social group and perhaps you’ll see the problem.
"White" isn't a racial group. "White" as an idea to describe a group of (roughly) light skinned European people, came about in order to justify enslaving and subjugating other groups. Various groups worked their way into being considered white over time, in part by contributing to the subjugation of others. And various groups once considered white, later were not considered so. "White" as what you call a "social grou…
I understand the academic underpinnings of that idea, but that's not how normal people understand the term "white." The Bureau of the Census, for example, certainly appears the believe that "white" reflects a racial category: https://www.census.gov/topics/population/race/about.html.