I seriously doubt sexism killed Hillary Clinton's chances of winning the presidency. Exit polls show:
18-29 year olds (19% of the vote) - 54% Clinton, 37% Trump
30-44 year olds (25%) - 50% Clinton, 42% Trump
45-64 year olds (40%) - 44% Clinton, 53% Trump
65 and older (15%) - 45% Clinton, 53% Trump
Women (52%) - 54% Clinton, 42% Trump
Men (48%) - 41% Clinton, 53% Trump
More women voted in the election than men did, but yet 46% of them voted against her. There were far more people 45 and over who voted than there were younger; yet the majority of the older people voted against her. She lost because she was a lousy candidate - period.