Having been around in this world for over 60 years, I've been witnessing this 'erosion' of the correct use of language for a long time. Back in my
days of elementary education, today's standards would most likely have seen a lot of students repeating years before allowed to advance but, as an
earlier poster stated, correct use of spelling, grammar and punctuation is not an indication of the individual's intelligence.
Not all that long ago these skills were drummed into us militantly but now those standards are considerably relaxed in favour of encouraging
creativity.
I still grind my teeth occasionally at some of the grammar 'crimes' I see in everyday life but I've not yet had a seizure over it (except for
rolling on the floor over some examples).
The message is, and always was, more important than the envelope it's delivered in