Two different accent stories--- well OK three- the first of which kinda explains the second.
My parents felt it was important to speak clearly and correctly (for the reasons noted above). Being native E. Tennesseans, they were familiar with our "hillbilly" image.
Dad's high school colors were blue and white. He used to say the school cheer- with typical E. TN pronouncation of the letter "i" was:
"Fite blue, fite wite. Fite Fite Fite." (Imagine a nasal twang as well).
So I tried to be careful of my "i's" and to not drop terminal "g's" on -ing words.
Nevertheless, when I went a mere 2 states north (to Cincinatti)- I was immediately tagged for my "Southern accent."
And in New York, a waitress loved the accent and asked if I was from Texas....