How many senate hearings have you watched?  It common to use testimony that is not a part of the senate nor for that matter in a political position.
C. King was also quoted by males I think the day before.    Honestly I don't think it was sexism as much as Warren threatens the established well healed money side of Congress.   The are Dem and Republicans with big bucks Wall Street backers.   Cutting at Warren is like cutting at candidate Trump, both threaten long established congressional power base.    It simple, the chairman doesn't like her- I can't read his mind.  He did not treat her equally/fairly- I don't like identity politics either.  She's an adult and can defend herself, which she did by reading the exact quote out of chambers.   PS.  I have no doubt Sessions was a product of the South he knew as a child,  People can change.