"beautifle" is just pain ignorant. How can you be a teacher - presumably someone who has read one or two books in your time - and spell so badly? That example isn't just a typo, it's so bad it's off the spectrum.
I could probably forgive a dedicated, inspiring secondary school science teacher for the odd spelling mistake, but really, the whole point of teachers is to teach. Which implies knowing what's correct and what is not correct.
The ability to look stuff up if you are not sure is an essential part of the job, surely. If a teacher can't be bothered to use a dictionary then what else aren't they bothered about?
Ds comes home convinced that every word that passes the lips of his teachers is God's holy writ. If Mrs Grey ever wrote 'beautifle' he'd think she was right and would completely refuse to accept any argument.
Dyslexia may be an issue for some teachers, but as someone said, people with dyslexia develop coping strategies. I'd be prepared to bet a substantial amount of money they make fewer mistakes than the lazy sods who just think spelling's somehow 'not important'.