The grammar nazi. The scourge of the Internet who are responsible for flaming to a crisp anyone who dares let slip an aberrant apostrophe. They can often seem a bit extreme – does it really matter if someone accidentally uses “their” instead of “they’re” ? Well yes it does, and I write as someone who all too often makes mistakes myself.
Firstly the improper use of certain words can dramatically alter the meaning of a sentence – your readers will not know what you intended if you make mistakes in the wrong place.
Secondly, the more mistakes you make, the less understandable you become; at a certain point you will give up trying to read something if it is too impenetrable such as “When u wana rip ppsls faces off but kno il get into a teeny bit of trouble n I hav white on blood is a…” (a real example). I can work out what that means, but I really can’t be bothered.
So go ahead grammar nazis; unleash the flame throwers, because some people need it.