It may be inaccurate if you make the assumption, but it's not implicitly racist.
I'm guessing that the caller was using African-American vernacular English, also known for five seconds during the 1990's as "ebonics". I think it's fair to say that most AAVE speakers are black. If you've spent enough time listening to black people - as you almost certainly have - you recognize it when you hear it.
And a great number of AAVE speakers spoke it before learning to speak (and hear! that part's important) standard English. And like someone who grows up speaking French and then later learns English, that person is likely to still have an accent, even when they code-switch over the standard English.
If you hear a French accent, you can probably assume that the person is French or Quecequois. Same principle applies to AAVE.
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I'm guessing that the caller was using African-American vernacular English, also known for five seconds during the 1990's as "ebonics". I think it's fair to say that most AAVE speakers are black. If you've spent enough time listening to black people - as you almost certainly have - you recognize it when you hear it.
And a great number of AAVE speakers spoke it before learning to speak (and hear! that part's important) standard English. And like someone who grows up speaking French and then later learns English, that person is likely to still have an accent, even when they code-switch over the standard English.
If you hear a French accent, you can probably assume that the person is French or Quecequois. Same principle applies to AAVE.