As someone who grew up rooting for the Orioles, I can safely say that any Nats fan still rooting for that team is an insane masochist.
I guess it helped that the team became a complete trainwreck from 2001-2003 that just couldn't sustain my interest, but I was driven from tepid supporter to full-blown hater overnight once I learned just how much Angelos had to do with keeping a team out of DC.
And after attending enough Nats/O's series, I can safely say that Baltimore fans are a bunch of mouth-breathing jackoffs who've driven me to root against that team long after Angelos kicks the bucket.