On the subject of blackface....

Buh bye.

Black face was used by white entertainers to appear as black entertainers because it's common knowledge blacks have more rhythm. No, that's not it.
If they wanted to fool anyone the wouldn't paint exaggerated features in white and red.

Black face was used by white entertainers to appear as black to make comedy routines funnier because it's common knowledge blacks are buffoons. So the slapstick would be more believable than from a normal(white) person.
I think that may be it. Plus if the act happens to make some people attach the buffoonery to a particular person and that person is offended, you don't want it to be an armed white man, nor him to know what you look like.

Am I missing anything?

Yes: in modern day, anything even approximating that is secret racism, which many white people believe is the worst form of racism.

I'm more against open racism like um, blackface.

And coal miners?

I'm against mining coal, but not coal miners.

Let them eat gas, solar, wind, and nuclear.

In addition, there's secret blackface in which white people wear blackface covered by whiteface and it's really hard to detect. You have to scrutinize every white person you meet for telltale black or grayish "smudges" where they got sloppy and didn't adequately cover the blackface; or, the whiteface got disturbed. Don't even bother looking for signs of secret blackface in photos; however, 'cause they're all shopped.

"Let them eat gas, solar, wind, and nuclear."

Nah, they just need to learn to code (like laid-off Buzzfeed 'reporters').

Psh. Coding is an after-school extracurricular these days. All the soccer moms became coding moms. But they're late to the party--the next wave of workers will contain far too many coders and not nearly enough geriatric caretakers.

truth

To be fair, who wants to spend their days taking care of baby-boomers?

Yeah, those boomer whippersnappers are all whiney and shit.

Meh... tell that to the young black kid who joked about how hot the white woman was in the 50s. Good thing no one ever got offended back then.

I hope to think that we have evolved beyond that.

We haven't. The power has just shifted a little.