I'm glad Nan started this thread. As you can see, I do not post much, but I have been reading most things on this board since it started and also many years when we were with Scout. You may not know me, but it feels like I know you.
I can tell you that over the last couple of years, I have been reading less and less, mainly because there are some frequent posters that I just skip altogether. You may be surprised that some of the posters I ignore have thousands of messages and thousands of likes and from what I gather, seem to be generally well regarded on the board. It's just that the common types of post from such posters (i) seem to merely "attack" other posters with "facts" (I use quotes because while no fightin' words are used outright, its clear to me to be condescending in nature), (ii) stating opinions as facts/gospel, and then hippocratically and condescendingly responding to any other difference of opinion/fact.
I may take some lumps for saying so, but I am surprised about what I assume are good people behaving so poorly on message boards (i.e. I hope you wouldn't behave and say the things you say about [insert any opponent coach, player or fan] if you interacted with them in person). Then again, maybe I shouldn't be surprised in this internet age.