Just remember front line staff are human and after the past week, are pretty fragile having endured just about everything that an airline horror movie could present them with. As posted, I was at FRA on Monday and found out my flight was delayed until the next morning so you roll with the punches. The first AC agent I had contact with was at the transfer desk, a lone woman facing a line that was increasing in length by the minutes. After my wait and being provided with my boarding pass and details of where to go from there, I commented that they should really send another person or two up to help her. A knowing nod.
Next morning after I picked up my upgrade boarding pass, thanked the agent and remarked on the tough day they must have had "yesterday" and to hang in there...can't get much worse. She thanked me.
Now if I were to run into a rampie, well my reaction might not be as understanding...