Yes, I have. I smile and nod. It's really none of my business, unless it's someone I know who makes it my business. At that point, I'll offer my opinion.
Having been on the receiving end of incredulousness by people who thought they knew me well, I still say an opinion is like an asshole in that everyone has one. There are some who can't imagine me being submissive and others who can't imagine me being dominant in any way, shape or form. I don't need their approval. To thine own self be true.