Of course, anytime you’re teaching something is wrong, you have to do so with the caveat with “for now.” In another ten to fifteen Years it may be professionally acceptable to flood your writing with double negatives. Not today.
BILLY: Didn't you tell us language evolves?
BILLY: And didn't you say English may be unrecognizable to us in 1,000 years the same way Old English is to us today?
HOBO: Excellent point.
BILLY: So my text speak is fine?
HOBO: I'll just do a grade correction in 1,000 years.