With no local team I gave up on baseball altogether for a long time. Rooting for the Os was never an option.
Same here - for my first 28 years' current residency here (1977-2004 inclusive) there was no team in DC but I never rooted for the Orioles - this isn't Baltimore and I don't support Baltimore teams any more than I do New York teams or LA teams or....
My first-ever live sporting event was a Senators home match at the then-DC Stadium in 1963 - that's a heritage I simply could not betray by supporting a Baltimore team.