time saving or lack of intellect?

I don't see how it is time saving when one has to stop and try to figure out what another is saying. I sit here sometimes reading it as if it is written in Sharepearian but I can understand Shakespear better then I can understand some of these slangs! Yes, I also know some view it as being time saving for the writer. But is it really time saving to replace dat for that? To me it sounds like baby talk. And what of people learning English? Now they are being subjected to slang that is improper. Maybe I am getting old. LOL Never thought 32 yrs was old. But I remember when people got older they complained about music not being music. Well, the times have changed and now we are saying that the words people use today are not real words. And they aren't. I just hope that with the changing times, Webster dictionary does not include dat for that, or dis for this. Because I remember my mother telling me that ain't was not a word and not in the dictionary. But it is now!!! Would you believe that I do not use that non-word to this day? LOL And nor will my children! Along with this improper way of writing.