First of all, have some respect for yourself Pittsburgh. Bullying Washington by rubbing a Stanley Cup banner in their face is like pushing a kid in the mud after you've already pulled his pants down around his ankles. You already embarrassed them enough. Pick on someone that can defend themselves.
Second of all, yikes. Washington might just regret not tucking their tail on that one, because that was about as cringeworthy as comebacks get. If I really had to choose I'd probably rather live in D.C. than Pittsburgh, but now is certainly not the time to throw the Capital building on a banner and remind people you're the home of The White House. Regardless of your political beliefs, I think we can all agree that keeping up with the election made grinding away in a steel mill look like an enjoyable alternative. The person running the Capitals twitter was pretty much in a no win situation with the team's wealth of playoff failures, but I think pretending you didn't see that tweet was a better PR tactic than using your city's political importance as a Trump card*.
* Yes, I already hated myself for making that joke before I finished typing it.