Tbf, who da f gives a damn about spelling in psn messages, you would have to be a very irl anal personality to use that as a turning point unless it was very specifically done to portray a stereotype.
I know it makes me seem like an asshat, but I care about spelling all the time. It's my biggest pet-peeve, I can't help it.
I get you but keep in mind the format its on. Like xbox/ps messages are typically expressed through a controller under a common time constrant of post game, pre-game match ups. Just a mixture of time vs effort not to forget that often times post game messages are emotional so it's not exactly a great indicator of someone's educational background, as opposed to their salt ass personality. Tbh, in my view the person has already 'lost' the interaction the moment they decided to begin one based on a tilt, giving them the satisfaction of a response in some of these situations only fuels their fire. What I often do to shut down hate mail fast if I was to respond, is just post the objective fact, generally in the form of stats with no commentary. Someone calls me 'camper', I just write '20-0' based on the game we just played, They say its because of this and that. I say '20-0'. Anything else they want to add? Oh you know what my response is... '20-0' Based on an incredible amount of experience, this shuts em up real fast. Everything else is just noise. Its fun to banter with idiots sometimes, more so than this current meta in Destiny, so in many cases the hate mail is an extended bonus victory game to play.