Is it improper to pronounce your T's as D's (America)?

So I was reaserching this and some people are saying that it's wrong and have a pet peeve for it but to me it's part of my dialect. I original come from a "country" like place and pronounce words like "butter" as "budder" and "three" as "dree". I live in the city now and people are having problems with it, not really the students but mostly the teachers which I don't understand because I told this one substitute " dree pages" and even though I don't pronounce it the same way as he does it's easy to understand what I was talking about. It's just like how some people pronounce "pillow" as "pellow" so I don't understand why people are getting upset over it
Is it improper to pronounce your T's as D's (America)?
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