I remember my father pointing out that there is a whole class of people that have spent their entire lives in institutions. Meaning, they went from high school, to college, then graduate school, then to work as teachers or government/social work, many never even working at any job outside of institutions their entire lives. That is where I suspect many of these liberals (especially the women) come from.
I don't know that Hillary Clinton, or Elizabeth Warren has ever had any kind of "real" job, but more likely some internships, and volunteer work for political groups. These people live in a bubble, and many of their supporters have too. It's a controlled environment, with set rules for advancement, tenure, pay scale, etc.
Most of the women (and some of the men) in my own family are from this class (mostly teachers), and EVERY one of them is vehemently anti-Trump, pro-Hillary (they love her).