When I was teaching freshman English at the University of Houston, part of my first-day talk was the detail that I expected standard English to be spoken in my classroom and to be used on all assignments.
Standard English did not include what was then called "standard black English," or Ebonics, which I forbade along with students' native languages.
When you're in my English class, you speak English.
Thank you! Proper grammar, proper diction, use the right word in the right place, and a curse is never the right word. Why should I be considered "weak-stomached" or puritanical if I don't like hearing foul language?