And that could be an attitudinal thing. Why should I care about how someone else personally identifies? Why should I be disparaging about something that will have minimal or no effect on me?

I think this is part of why some conservatives find themselves unwelcome. Being outwardly disparaging toward people does not make you friends.

I'm offering an alternative view of "bat shit crazy".

It may be harmless (as you correctly point out), but it is not tethered to reality.

Fascinating. Have you seen the mainstream left be actively accepting of it?

Rachel Dolezal (by far the most famous case that I know of) was pilloried by the left for cultural appropriation:

https://www.google.com/search?ei=x-UhWuymEIyojwOc6Kz4Bw&q=ra...

Thanks for providing the search link. By my reading, a lot of those are sympathetic to Dolezal, not critical.

Shouldn't there be universal condemnation?

Why should there be universal condemnation or acceptance?

"The left" is not a spec or rigidly defined ideological canon that all "leftists" conform to. As with "the right", "capitalists", "socialists" or any other political or cultural generalization, actual "leftists" can comprise a spectrum of acceptance or disagreement.