Have you ever thought that perhaps the bathroom wall crapola might be another tactic used to discourage the flow of information on these boards?
I've often noticed that a great post is followed by a plethora of garbage. My guess is that this could be done to deflect attention from important discussion, and "bury" the good stuff in moronic fluffery. Infrequent visitors to a board see nothing but idiocy and so move on. Good way to quash rational discussion.
Ignore them as best you can, but if you do move on, then good luck in all your future endeavors. Regretfully, in 13 years of posting on various web venues, I've gotten sucked into responding to the cretins on a few occasions, and like yourself have more than once considered throwing in the towel. Perhaps I still may.