It's a typical side-effect of writing anything online. I've had this experience with nearly everything I've ever posted (also: a lot of great comments too). Whenever you want to share knowledge about X: out of the woodwork crawl out the little pests who have nothing to do except hold you to the highest level of scrutiny they can imagine, and they'll word it like they want to crucify you for the slightest infraction.
It doesn't mean anything except that there's a lot of people who are situationally deficit of social skills and anxiously trying to prove they're even smarter than the original poster.
My pet theory is that these jeklers want acceptance and a sense of community, but don't know how to do it.