I once had an interview for a job while I was already employed. They asked why I wanted to leave my current job, I told them I didn't and that I liked my job, b

I once had an interview for a job while I was already employed. They asked why I wanted to leave my current job, I told them I didn't and that I liked my job, but I also look for better opportunities. My interviewer seemed incredulous at this concept, and thought I was wasting her time. Does she only want to hire unemployed or unhappily employed people? So dumb.