I wouldn't sweat minor typos, summer. Longstanding 'Netiquette (dating back well before the Web to the ARPANet days in the '80s) allows for typographic errors or mispellings without criticism -- even for teachers. My Mom is both a teacher and writer and occasionally (but rarely) makes typographical, grammatical or spelling errors in emails, then seeks to correct them, whereupon I must reminder her of this ancient convention. It's endearing but unnecessary.
Of course, there are those who harp on such things either deliberately or through ignorance. In either case, you would be well-justified in ignoring such quibbling and focus on topical posts. After all, if you post an article for discussion and someone has nothing better to do than take potshots at your spelling, they're just yanking your chain, and you should simply hang up on them.
Oh, and THANK YOU for being a teacher. That's right up there with police officer, firefighter and soldier, as far as I'm concerned -- and you have probably found elements of all three of those other noble professions in your list of responsibilities. It takes courage to be a teacher, especially these days, and I respect that. For any other teachers who may be reading this, that goes for you, too: a BIG SALUTE.
Best regards,
Imal