Are you surprised when a good meaning person asks when a slightly chubby woman is due, when she isn’t actually pregnant?
Actually, yes, because that's been widely known as a risky question to ask for so long it would surprise me. Then I would question them actually being a well-meaning person.
My sister was standing outside a gas station with a close friend of hers. Her friend was enjoying a cigarette when an old man walked up to her and said, “You know, you aught to give that baby a chance!”
She was not pregnant. That was the moment that turned her around and made her go on a diet though, poor thing.
Not surprised, but I'm also not convinced it's well-meaning so much as ignorance to the effect of their own actions. Otherwise, I think were mostly on the same page. It generally should be considered uncool to ask someone a personal questions without a valid reason to do so, regardless of age, genital status, or arbitrarily assigned category loosely based upon skin or the overall attitude of one religious group towards another.