Agreed; but as my Gram was fond of saying, there’s a time and a place for everything.
Context matters, as does the audience one is addressing.
I love using slang and especially my personal colloquialisms, but I am still well aware that such speech is not appropriate in the classroom or in the workplace.
Furthermore, I have issues with Chalabi’s basic contention; “It doesn’t really matter,” because that mentality can all too easily justify and contribute to the Dumbening.
How we speak often does matter, just depending upon the particular circumstances.