For some context: DC in the 1950s and earlier was middle-class / lower middle class town when most people worked civil service jobs for the US government. The Washington Post ran a regular column by Bill Gold called "The District Line", which talked about which agency was hiring and GS-this or that. There were no rich people since there was no industry and, therefore no big deal owners. (People who did not work civil service, like my family, worked for PEPCO or C&P Telephone, or Capital / DC Transit.
Baltimore had blue collar workers, like DC, but also had owners of sizable companies. That was the beer people, the Hoffbergers. DC's only business, to repeat, was the Federal Government, and no government worker commanded the money that a Baltimore millionaire did.
That must have lasted into the 1980s. My old company, GE Information Services, moved to Bethesda because management found that there were more computer programmers around Washington than anyplace else. They gathered to work for the government, and our big boss, Warner Sinback, stunned senior GE management when he showed that DC was a higher-tech place than Phoenix, where the entire computer division had been.
It took a while, but other tech companies saw the same thing that Sinback and GE saw.
That is, it seems to me that Baltimore is envious of the advantage their city once had. So be it. Maybe the Orioles should move back to St Louis. "Browns, come home!"