i realy don't see the problem and the thread smells of trolling / half-story. Then again i personaly use sarcasm as a go to response when trying to educate others, because realy you have 3 options right? the whole motherly "dont worry baby , you made a mistake im SURE you'll do better next time" wich i can't stand, straight up yelling and cursing wich makes you look twitchy and alot of the times just makes you look like you're talking out your ass and providing no real info, and the kinda chain jerk sarcasm that while to some REALY sensitive types may be offensive , as long as you mix in some humor with information is fine.
I mean op at one point gives an example along the lines of "no shit!, if you don't stand in fire you don't die, omfg wait i need to write this down" but the alternative would maybe be "what the fuckedup retardedness are you doing you cunt?! don't stand in fire!" or you know.... "damn poor x, stood in the fire again, ow well im sure hes figured out hes not suposed to do that". The 2nd will just provoke a stouborn / deffensive attitude where ppl migth stop paying atention / doing stuff out of spite and the third isn't realy a way to whip raiders into shape.