Doesn't it drive everyone crazy when your girl/boyfriend constantly corrects your use of verb contractions to start a sentence.
- Doesn't it drive you mad when you know you're right but the other person refuses to consider that a possibility?
- Doesn't it drive you mad when people make a huge deal about you making a small mistake?
- Doesn't it drive you crazy when a small client who is clearly on a shoestring budget manages to pay you on time but that huge corporate or government client keeps you waiting?
All I can say is that you need a question mark:
Doesn't it drive everyone crazy when your girl/boyfriend constantly corrects/is constantly correcting your use of verb contractions to start a sentence?
I understand that the use of verb contractions is best avoided in formal writing, but is it grammatically correct to start a sentence in conversation using one.
Why not? I found it in many interviews all around the Internet. It is not a true question. It is a call to agree with the observation that follows and to give the personal reasons or opinion.