The sole purpose of the post was to anger and insult. We all know this.
Welp, now that you've successfully hijacked the thread, without trying very hard I can think of at least three alternative purposes for the post. However, as I am unable to read the mind of LDB, I am not as sure about it as you are.
The fact remains, in any case, that Harris herself is practically a chameleon when it comes to racial self-identification. Prior to running for and becoming a US Senator, she mostly stuck to black, Indian-American, and Jamaican-Indian to label herself. When she became a Senator, the media affixed to Harris the label of "Second African-American Senator" (snubbing Jamacia and all of South Asia), and she embraced the opportunity to expand her repertoire from chameleon to cuttlefish, donning whatever label suited that day's situation.