There are several things going on here ...
1. Lazy is lazy is lazy. I realize we're not typing up resolutions for the United Nations, but correct grammar is correct grammar, and should be used in ALL communication.
2. As a professional writer, I can tell you that being a "good writer" is not the same thing at all as using correct grammar, spelling, syntax, and punctuation. Those are the BASE MINIMUM skills. Being a good WRITER is taking it to a whole different level by using those basic skills to artfully and masterfully convey complex ideas and narratives. It's like defending someone's inability to add 1+1 by arguing that they weren't "blessed" to be a good actuary or statistician. Basic arithmetic -- addition, subtraction, multiplication, and division -- are BASE MINIMUM skills just to be a contributing member of society, regardless of occupation or profession. As are basic spelling, grammar, and punctuation skills.
3. Not to attack Evan, but the word "tomorrow" is a second grade vocabulary word. It is a word heard and read EVERY SINGLE DAY by nearly every adult not in a coma (and quite a few IN comas, most likely). No 13-year-old should see the word "tomaro" and think it's the correct spelling.
4. I'm troubled by the increased dependence upon "spellcheck" (which was Evan's defense) by the younger generations. Just as I'm increasingly worried about the younger generation not even learning how to write -- cursive or printing, for that matter -- with a pen or pencil at all. Their technology-obsessed parents think its so cute that their children go immediately from drooling in a sippy cup to punching out words on a keyboard. It is a dangerous dependence on electronics that will leave these people in a major bind if and when the electricity, for whatever reason, goes out for any extended period of time. Our entire modern infrastructure is more delicate than most people care to think about; we're just one atmospheric bomb detonation away from the nation's entire power grid getting fried, and the power going off -- for YEARS. Knowing how to intuitively spell correctly and communicate via pen and paper will be paramount. At the very least, barring any disaster that takes our electricity away, handing over these very basic human skills to computers makes us as a human society collectively weaker.
5. All THAT being said, we don't know Evan's situation (could be dyslexic, etc.), and correction should be given gently and good-naturedly. People -- TEENAGERS in particular -- don't respond well to condescension. Any correction should be done in the spirit of helping that person better themselves, rather than one feeling superior to another.
6. He was so excited about getting his first Fantom, and just wanted to share that excitement with the rest of us -- people who GET it. Don't break that spirit.
7. Let's give Evan a collective hug and welcome him back.