An inability to speak well will always be a handicap, and anyone who pretends otherwise is no friend to those he or she would keep in ignorance. If a certain dialect or manner of speaking is something that you wish to keep, to use with family and friends, by all means you can keep it for that reason. But, make no mistake, the larger world does not embrace it, and it has nothing to do with skin color.
Exactly. We all need to use two dialects.
The dialect we grew up with and a common "business dialect".
I really enjoy the sound of a deep south black person or anyone from Cajun country, Texan, etc., talking in their native dialect.
I try to slip back into my back woods native Vermonter dialect at the same time to hopefully entertain them as much as they are entertaining me.
On the other hand, I am a hopeless grammar, punctuation and spelling snob.
Unfortunately I also have some weak points in those areas myself.
I prefer to have a fellow stickler correct me when I goof up, rather than just let it go. It helps with the learning process.
We are a nation of varied dialects, I know of at least four different ones in two counties of Vermont, and can tell you what town a proper native speaker is from. These are of course real, 8th generation Vermonters, not the posers who have invaded the once wonderful state.
Hopefully no one will lose their unique ways of speaking and writing, but add to their abilities proper English for the times when it is needed.