I worked for a company in my mid 20's that wouldn't hire anyone not white. I head the boss' wife, the "Office Manager," joke about she could always tell who was black, no matter how "good they talked on the phone," because they would always pronounce words that ended in "ment" as "mint." As in "depart-mint." They all thought it was hilarious. I wasn't there long.
Oh! Now I understand why my English teacher was a total fascist when it came to those kinds of pronunciations! Pen-guin got us a fair few times. Neat. She was just extra racist.