Checking into the flight at Las Vegas was less than convenient because over half of their kiosks had out of order signs. There was an agent barking at those trying to check.  She said that they had to form only one line, but the rope dividers were not set up properly for one way flow and some had missed the turns in the flow.  She just barked at them, that there was only one line... People were confused but she treated them as if they were trying to cut in line...which they were not.