Get a grip??!
"Try acting like human beings and a little less like air Nazis and you just might notice a difference."
air Nazis?! What a ridiculous thing to write. You seem to have lost sight of the fact that cabin crew don't make up the rules of aviation safety, they TRY to enforce them. It's people like you who seem to think you're above the rules, and that makes the crew's job that much harder. Never in the history of aviation has a passenger reached the terminal before the aircraft has, so it's beyond me why anyone would feel it necessary to stand up before it's been deemed safe for everyone to do so by the captain. This particular steward was simply trying to enforce that rule, believe it or not for the passenger's safety and the safety of those around her. She ignores him, and look what happens - he gets hit with her bag. If it hadn't been the steward who was struck, it would have been another passenger who, knowing americans, would probably have then sued the airline for not enforcing the safety rules properly. He's damned if he does and he's damned if he doesn't.
So I think you'll find you're the one that needs to get a grip. Respect works both ways, and if passengers would just have respect for the job the cabin crew do and follow the rules laid out for everyone's safety, incidents like this would never occur.