Ya know, if it is the last leg of the trip and he is a commuter on a tight connection there are ways to get even...
Unfortunately the passengers suffer in this type of civil war, but by the same token you didn't start it, he didn't care about the passengers when he refused to help expedite problem-solving at the gate and if you fail to defend your position you will be stepped over by these types of guys with regularity.
The bottom line is that if the FA's don't take themselves seriously they can't expect others to do so.
F/As are not charged with solving other employee groups problems, dup. seats, no aircraft servicing, etc.
The fact that they are min. staffed and agents operate with obsolete equipment (it may look new, but, in fact, is simply a rehash of old technology), min. staffing at servicing, etc. This corporation _only_ changes when pax go elsewhere. It is written in their mission statement, so changes
will require pax inconvenience. Get over it.
Tell the "inconvenienced pax" that the problem will be resolved when the agent comes down.
The pilot is exactly correct.
Do not violate the company's own rules. Fly safe and by the book.
Believe me, the inconvenience will only last a few days. It is almost like riding a motorcycle in cold wx. You can go fast and brave the extreme cold, minimizing the time for discomfort or go slow and "enjoy" not quite so cold for a much (sometimes, forever) longer time.
Try choosing something different than you have been doing for so many years. Try "fast".