Well I felt pretty grumpy yesterday.
Arriving on a connecting flight, my boarding pass could only be printed at the gate at -40 mins.
The same handling agent wouldn't give me access to the lounge, even though I had a business class ticket (260€ one way), because I didn't have a boarding pass.
The fact that this was caused by their inability to handle their airline appropriately did not worry them one jot.
And the airline staff wonder why we are grumpy when we have been ripped off.