I know you're supposed to stand up during The Star-Spangled Banner. But do I have to do it if I'm at home? Do I have to stop typing on IRC for the duration?
Also, James Taylor has turned our national anthem into an Adult Contemporary Christmas song. I expected a crossfade into Kenny G or Enya or Sarah McLachlan's "Adia" afterward.
Considering that I rarely partake in any patriotic activity (especially at sporting events) I'd say you're in the clear. Standing is a choice. So is typing. It depends on how crazy-patriotic you feel you need to be at any given time.