I view it as a matter of basic politeness. Students are quite welcome to be as cutesy and informal as they like when they're chit-chatting with their little kiddie-friends. But when they're asking complete strangers for the favor of assistance, they can danged well show some basic respect.
And for them to claim that they type, for instance, "know" as "noe" because they "dont hv tim 2 spel" is just plain insulting. They don't have the time to bother speaking clearly, but we losers, allegedly having nothing better to do with our lives, have the time to puzzle out what the heck their crypto-lingo means, figure backwards to divine all the omitted information (like the instructions), and then provide a complete worked solution prefixed by a mini-lesson...? And hurry up, cuz they been waitin' like a whole three minutes!!!!
I'm not usually one to endorse "zero-tolerance" "solutions", but I certainly wouldn't object if the mass of tutors stopped polishing their crystal balls, trying to figure out what these smug elitists want, and instead replied along the lines of, "I'm sorry, but you will need to clarify your post before it can be answered. Using standard punctuation, spelling, and grammar, along with posting the exact text of the exercise, will be very helpful. Thank you for your consideration."
Just my (old and grumpy) two cents....
Eliz.