maybe the quality of service declines as the quality of customer declines
I so agree with this and have often opined that some people don't know what level of customer service they're entitled to and how to properly ask and receive such service.
On the plane the level of service changes according to class flown and status level. In first I would expect to have the call bell answered within 20-30 seconds barring exigent circumstances. In Y it could reasonably be a few minutes or even longer.
Some people loudly and impolitely demand F service in Y and scream and whinge if not received. Also there are times when the demanded service cannot be provided.
As long as the person has done their best and sought assistance if required and explained why they cannot assist then some people need to learn to let go and move on. Screaming and loudly whinging won't engender any support from the company you're complaining to.
As a customer service provider when seeking initial resolution don't walk up to me screaming I'm scum and immediately demand a manager. I actually know what I'm doing and if I need a manager because the resolution is beyond my authority I'll call them after I've clarified the matter at hand and can explain it up the chain so my manager understands it very quickly and can act immediately. They're busy as well.
Oh and if you're reasonable and the issue isn't totally clear or even grey as to whether or not you're entitled to a particular resolution I might even be an advocate for you if appropriate.
However, if you're successful with your inappropriate screaming and whinging be aware that your cards are marked and don't expect the company to bend over backwards again. Companies are aware of your worth and some are even saying don't come back.
Also if you're ultimately successful after your inappropriate behaviour don't come to me if there is the slightest bit of discretion in a future issue. I'm going to give you the bare minimum according to policy. With a smile and the greatest courtesy but right up to the basic limit.
Offer a reasonable resolution and be prepared to compromise. Make sure your own behaviour is exemplary. A please, thank you, quiet and reasonable tone while concisely setting out your issue and desired resolution makes the path to completion so much easier for all involved.
You might just be amazed what can be done