I've asked both men and women that have interviewed me if they are engineers.
The OP's anecdote sounds genuinely sexist and in a really bad way, but I can also imagine a situation where someone says he has never been asked if he's an engineer because the question was not confrontational e.g. casually at the beginning of an interview "So what's your role at COMPANY X, engineer?"
I've gotten that question, but I've never gotten it until I ask if the interviewee has questions. And it's never been in the form of questioning my credentials.
The OP's anecdote sounds genuinely sexist and in a really bad way, but I can also imagine a situation where someone says he has never been asked if he's an engineer because the question was not confrontational e.g. casually at the beginning of an interview "So what's your role at COMPANY X, engineer?"