Bad day... bad day. There are very strict regulations flying into Washington Dc (and out) and apparently it's been too long since the vast majority has been petrified into submitting to FAA and they think they are under the impression that because they are white and own a suit that they are above Federal Law and can do what they please.
Not on my boat.
I do not care who you are. What color/religion/whattheshitever you are. If you stand up and approach the flight deck after you have been told 8 times not to... haha... you will be reminded that interfering with crew member's instructions is a federal violation.
It's the nation's capital. Do NOT test me. I am hostile. And PMSing. And go ahead and dismount before complaining to a gate agent at DCA that you were not allowed to potty because they will recite the same FAA guideline I memorized. FEDERAL LAWS are FEDERAL LAWS. Piss when the seatbelt sign is off, or meet Washington DC's finest. I'm sorry that you make poor decisions. But it's law, and you knew that would be the case before we shut the door.