I heard a fellow teacher say-

[Lionessa]

10. You strongly suggest he's somehow a subpar teacher in your title and then

somewhat in the body. I just feel you should be called on that. Most science teachers wouldn't care or even notice and might have poor grammar themselves as many analytical folks seem to lack writing skills. I guess in my family the engineers, computer geeks, and mechinists came to us more verbal folks for proofreading, we didn't ever think of them as stupid or less, just as we didn't consider ourselves less because when designing something we had them proof our plans.

If proper grammar is or ever was important to communication on the general level, (yes in some arenas very important, but in general living...) we'd be in pretty sorry shape these days after centuries of communication without regard to grammar for 80-90% of the global population. I mean, yeah, it's sorry shape, but it'd be so much worse. Literacy and knowledge and communication can and does, thank goodness, occur without proper grammar.

I don't see that really changing.