The Death of a Language

My son: Where r u
Me: I am home. What do you need? (OK, I struggled a little bit when typing the question mark:-))
My son: I m hot can you pick me up
Me: Don't you want to go to the nurse first?
My son: k will do

This is a typical exchange that is happening more and more often with my kids. I am somewhat appalled and offended by these exchanges. Wasn't language the linchpin of our development as civilized human beings? Wasn't language supposed to express our education and refinement?