For better or worse, grammar, punctuation and spelling ARE important and DO matter when it comes to how people regard you and your views. You can choose to ignore that or choose to deal with it.
If some genius asks you to "proofread" their notes before they send them out they are implicitly acknowledging a problem with their communication skills, otherwise they would send things out "as is" and not care.
Good spelling & grammar = thoughtful, erudite, respectable, extremely good-looking.
Bad spelling & grammar = dimwitted, intellectually lazy, career criminal, body odor.
Is that fair? Probably not, but life in general is not fair. If it was, George W. Bush would be assistant nightshift manager at a Waffle House in Amarillo and living in a trailer park.