Commissario
it's one of the things i've seen mentioned so many times on commentaries and with actors who had rough spells, same as you say with the likes of panel show guests.100% true. You’ll be amazed at how often actors (or panel show guests, stand-up
comedians, etc.) are chosen based on who turns up on time and is polite to the producers.
The likes of panel shows especially if you get a rep as being a pain it rapidly spreads because there are only so many companies making them, and hiring the guests.
If you are pleasant to work with and punctual most productions won't care much about your personal politics or religion, but i've heard of so many tales of someone who was well paid in a good role and let it get to their head and they became unpleasant to the "staff" especially lower level actors or production assistants. Those production assistants often end up as more influential after a few years and remember the actors that treated them ok, and definitely remember those that treated them badly.
I wondered a bit about Sorbo, then read how he behaved and how he basically killed off a fairly expensive show because he demanded major changes, meanwhile the actress from the spin off of his previous vehicle seems to have kept working in good shows whilst he's stuck doing z list stuff (IIRC something similar happened with Dean Cain after Superman, whilst his Lois has done fairly well).