Why did you waster your education?
"Why did you waste your education?" - If anybody EVER says that to you during an interview, or makes you feel badly or uncomfortable in any way, LEAVE.
That's not a good environment!
When you go on a job interview, it's not just them interviewing you, it's also you interviewing them to see if it's a place where YOU would want to work.
You are all amazing, accomplished woman, in many areas of life, and no one has the right to make you feel inferior.
As one of my clients, a single mom with a Masters Degree and a GAP on her resume stated after we started working together, "I used to beg people to give me a job, now I confidently say, 'this is what I can do for you.'" - P Brown
...by the way, she got the job!