A Brooklyn lawmaker is accusing Major League Baseball of disrespecting 9/11 first responders by refusing to allow the Mets to wear caps honoring the heroes on the anniversary of the terrorist attacks. City Councilman Justin Brannan fired off a scathing letter to MLB Commissioner Rob Manfred last week demanding the league let the Mets wear caps emblazoned with “NYPD,” “FDNY” and other first-responder agencies for the anniversary of the Sept. 11, 2001, attacks. Any other teams wishing to do so should be allowed also, Brannan wrote. The Bay Ridge-based Democrat made the plea after MLB rejected the team’s latest request...