What, specifically would you like to have cited? White representation in tech? That's easily Googlable, and a number of citations emerge immediately[0][1][2][3][4][5][6][7][8][9][10].

As for "cancellable" demographics, that makes a ton of sense; there's a lot of (societally encouraged) entitlement among white men that results in some pretty terrible behavior. Hopefully over time white men will start recognizing how when they act a certain way, it's not the same as when a non white male acts that same way.

[0] https://www.latimes.com/business/technology/story/2020-06-24...

[1] https://mashable.com/article/diversity-report-silicon-valley...

[2] https://www.techrepublic.com/article/5-eye-opening-statistic...

[3] https://www.umass.edu/employmentequity/sites/default/files/C...

[4] https://www.chill.us/entertainment/2018/10/15/tech-so-white

[5] https://www.computerworld.com/article/3574917/the-state-of-e...

[6] https://www.forbes.com/sites/forbestechcouncil/2020/11/18/ra...

[7] https://www.eeoc.gov/special-report/diversity-high-tech

[8] https://www.business2community.com/workplace-culture/white-e...

[9] https://www.zippia.com/advice/diversity-in-high-tech-statist...

[10] https://www.shrm.org/resourcesandtools/hr-topics/behavioral-...

None of these references address the broad, cross-cultural historical claim that

"White males have been speaking freely (and continue to do so) for as long as the concept of racial hierarchy has existed."

Sure, if you ignore all the other demographics.

Usually talking anything disagreeable will get you anywhere from passed over for promotion, shitcanned, fired for any imaginary reason of applicable. It affects women more than men, and interacts with racism too as judgements are harsher, so the threshold of what is "unacceptable" is tighter.