Sadly, not hard to believe at all. It seems that on day one of a new thread, one third of the posts are scolds, as in "you did something stupid/wrong/different" - another third are poor attempts at stand-up comedy - and the final third might somehow be tangentially related to the subject. After that first day, most of the threads degenerate into political screeds, WD-40 retorts and stories about the "good old days." I think that's why a lot of web-based boards and chat groups encourage people to vote for the "most helpful" answers. That tends to quickly sort out the people who are genuinely interesting in helping from the people who feel compelled to respond to every post, whether it's relevant, helpful or completely self-serving.
Some threads remain remarkably free of drift while others, like this one, wander away in the wrong direction right out of the starting gate.
-- Bobby G.