Have you ever gotten one of those "customer service representatives" or "technical support" persons who is obviously in some off-shore telephone boiler room that speaks with such a heavy accent that you finally give up in frustration because you can't understand a word they say?
What if that person were your teacher? What if they were your teacher of English?
Is There a Spanish Version of Ebonics?
How could a child be expected to learn to speak English if the teacher can't be understood by native speakers of the language? Why shouldn't we expect that a teacher be able to speak the language with grammatical precision?
Maybe a more serious question is how did these teachers get certified in the first place? Do we need some form of license renewal for teachers which insures that they continue to meet minimum standards of competence?