We've been given a few reasons (excuses) for Teener's poor English.<quoted text>
Good point. Actually, in the world of smart phones, it can be difficult to type apostrophes. Since languages simplify their grammar over time, it's possible "your" may become the norm for both words. It'll just upset the traditionalists.
First, it was dyslexia.
Then it was typing in traffic on her laptop.
Then it was typing at lightning-fast speed.
Now it's the educational system.
Teener may be the product of poor schooling. She may have been a bad student; she may have viewed school as just a way to catch a husband.
Funny thing is, almost everyone knows how to spellcheck. And Word can check grammar.
But the valley girl doesn't care. She's so smart that the rules of writing don't apply to her, and her message of cavemen building ships on frozen rivers is more true than your group of stupid NASA scientists.