It's tough to explain it to someone who hasn't been around for very long and gone through it all. Some of us remember all the crap the orioles' fans talked about the Nats and their fans beginning in 2005. They considered themselves superior to us and talked crap about us and our franchise because we infringed on their so called territory. I can't even imagine the crap they would talk if they end up going deeper into the postseason or worse if they beat the Nats in the WS.
I'm just happy people in DC have stopped yelling OOOOOOOO during the anthem.