I do hate to see this turn into a back and forth which never ends but I have never been one to hold back so I’ll put in my 2 cents.
Legally speaking this forum is jeffs property, and that is how I think of it, if we were in jeffs house talking about our new skidder and someone was being insulting or belittle to anyone in the room I would expect jeff as a good host to show them the door, but even more to the point if someone walked in and insulted jeff to his face I think we would all expect jeff to have a few harsh words for him before he shows him the door.
I don’t think the medium we use changes the way we should behave; just because we are on the internet typing and not looking someone in the face doesn’t change the fact that we should be generally nice and try not to insult anyone… that’s just common etiquette IMO….