I'm OK with cheering for the O's as long as we stomp them in the WS. So I will cheer O's. Better than cheering for the Yankees.
Uh, I don't know if you've been paying attention for the last 5 years, but the Nats are completely incapable of "stomping" the Orioles, let alone getting any sort of meaningful victory against them.
I'm going to the dark side.