
It's pretty common in roleplayers, actually. The original statement was extremely snarky at anyone "doing it wrong" which is a slap in the face of anyone working to tell an alternate take on something (and by now, could have been doing it for anywhere between two and five years).
People are going to get defensive when someone they've never met makes blanket statements inferring they suck.
People are going to get defensive when someone they've never met makes blanket statements inferring they suck.