He then dug in on Monday with a video in which he denounced “the Democrats’ diversity obsession” and described Vice President Kamala Harris as a beneficiary of an “affirmative action regime.”

“Finally a compelling explanation for why our economy is doing so well,” Mr. Masters wrote on Sunday in response to an Associated Press report that found there were, according to the news agency, “more female, Black and gay officials contributing to the central bank’s interest-rate decisions than at any time in its 109-year history.”

The post drew swift backlash, which Mr. Masters alluded to in a follow-up video Monday evening. “Well, this tweet made people mad,” he said, before adding that he didn’t care “if every single employee at the Fed is a Black lesbian as long as they’re hired for their competence” and that he had “never spoken to anyone who can say with a straight face that Kamala was somehow the most qualified candidate for that job.”