Yes that's my claim, and yes there is evidence for it: http://www.npr.org/sections/money/2014/10/21/357629765/when-.... From 1970 to 2005, the proportion of women medical and law graduates went from 50-10% to nearly 50%. The proportion of computer science graduates went from 15% to 35% in 1985 but dropped below 20% in the 2000s.
There are only three possible explanations for that data. (1) certain industries got less sexist while computer science lagged behind; (2) society got less sexist about women going into certain industries; or (3) womens' biological preferences changed dramatically over just a few decades.
(3) is ridiculous, so the answer must be (1) or (2), which are both the product of sexism.