I type properly in fully structured sentences at all times. And I still type faster with one hand than the rest of my school does with two. For example, here is exactly what someone on my MSN contact list has for a display name right now:
Obviously blocked. I block anyone who doesn't type at least partially properly. Spell "you" with a y and an o and you've got my attention for another five seconds. Deciphering 1337-speak is not worth my effort.
An elitist attitude to the whole thing doesn't help either.
They just need a little nudge in the right direction, not shot down outright.