It’s one of the ways the English language creates a class society. Upper class folk learn these differences; lower class folk don’t learn them. Other languages may have ways to do the same.

I had this on my desktop at work due to the incredibly poor grammar my co-workers were flinging sound; but that makes me a negative bully. (Shrugs)

It is an indication of a failure in teaching the basic building blocks of English language and spelling. Children need to be corrected and marked down by primary school teachers (I’m British, so I presume that must be equivalent to US grade school). It’s not just a problem in the USA, we have neglected the proper teaching of English, especially English grammar in the U.K. for decades. I’m pleased to say that seems to be being addressed now, because my eight year old grandson surprised me by his knowledge of conjunctions and gerunds, something my son, his father, who is now 40, was never taught at school, and which I found appalling!

it's an evolution of the language. it's actually silly to have 3 different ones in the first place.