Study shows class bias in hiring based on few seconds of speech

The idea goes something like this. You have white privilege because you are visibly white. By being visibly white you gain an automatic differentiation from those who are non-white. The belief is that the system, being largely run by white people will extend courtesy and nicer treatment to those who look like it whilst those who differ in appearance must "earn" the position you are given by the elements of your birth. It's a bit more complicated than that but that's my understanding of the core of it.

I am not trying to strawman the argument and if I have it wrong, please explain where I wandered off course.

Also called "Standard American English" (as noted in the article). It's what you mostly hear on the radio, in film actors when they're acting but not "doing an accent", among professional newscasters, et c. It's not been static through time—ever watch early talkies or listen to '30s radio serials?—but it exists.

    Henry Higgins: 

    Look at her, a prisoner of the gutter,
    Condemned by every syllable she utters
    By right she should be taken out and hung,
    For the cold-blooded murder of the English tongue.

    Eliza Doolittle: Aaoooww!

    Henry (imitating her): Aaoooww!
    Heavens! What a sound!
    This is what the British population,
    Calls an elementary education.

    Pickering: Oh Come sir, I think you picked a poor example.

    Henry: Did I?
    Hear them down in Soho Square,
    Dropping "h's" everywhere.
    Speaking English anyway they like.
    You sir, did you go to school?
   
    Man: Wadaya tike me for, a fool?

    Henry: No one taught him 'take' instead of 'tike!
    Hear a Yorkshireman, or worse, hear a Cornishman converse.
    I'd rather hear a choir singing flat.
    Chickens, cackling in a barn, just like this one (pointing to Eliza)

    Eliza: Gaaarn

    Henry (writing, imitating Eliza): Gaaarn..

    I ask you Sir, what sort of word is that? (to Pickering)

    It's "aoow" and "gaarn" that keep her in her place
    Not her wretched clothes and dirty face
    Why can't the English teach their children how to speak?
    This verbal class distinction, by now,
    Should be antique. If you spoke as she does, sir,
    Instead of the way you do,
    Why, you might be selling flowers, too!

    Henry: An Englishman's way of speaking absolutely classifies him,
    The moment he talks he makes some other
    Englishman despise him.
    One common language I'm afraid we'll never get.
    Oh, why can't the English learn to
    set a good example to people whose
    English is painful to your ears?
    The Scotch and the Irish leave you close to tears.
    There even are places where English completely disappears.
    Well, in America, they haven't used it for years!
    Why can't the English teach their children how to speak?
    Norwegians learn Norwegian; the Greeks have taught their Greek. 
    In France every Frenchman knows his language from "A" to "Zed"
    The French never care what they do, actually,
    as long as they pronounce it properly.
    Arabians learn Arabian with the speed of summer lightning.
    And Hebrews learn it backwards,
    which is absolutely frightening.
    Use proper English you're regarded as a freak.
    Why can't the English,
    Why can't the English learn to speak?