This is my 5th year at K-con, and while I did find the hotel staff much more high strung than usual, there were also more people than usual. I did experience first hand the hostility of one of the hotel staff, but you have to remember that they're watching after all of us to make sure nothing happens for hours at a time. And you can't deny that many con goers don't have the most patience. I definitely heard one guest shout profanity at a hotel staff member, though they ignored it. They get upset if they're going to miss an event because the elevator person won't allow one more person on, with good reason. But there really is nothing that the staff can do; these rules are set in place, and its for your/guests that aren't part of the con's safety.
Getting upset at the hotel staff won't do anything, and this year, put yourself in their shoes for a moment, with all that chaos, and frankly, some nasty attitudes, around you. I know I wouldn't last 2 hours with all of it around me.
All in all, if hotel staff are rubbing you the wrong way, just walk away, and do something else. If they're blocking the only way down to an event (which is very unlikely :|), there's nothing you can do about it, and there are a lot of people in the same boat as you.
Honestly, cons are meant to be a pleasant experience, and you shouldn't let a stressed out staff member ruin that for you.