I've worked in tech for 25 years. I've witnessed the hostility and exclusion in a variety of ways--some subtle, some not. Recently, I facilitated a series of meetings with a prominent tech company. The smartest person in the room was a female, but she was one out of 40 male managers in attendance--all were white, 40ish, with stay at home wives. One evening, there was a bus to take everyone to dinner. It was a party bus with a stripper pole in the middle. I was the last to board, not realizing what was inside, and just before I had boarded, someone in the all male crowd made a comment that the next person to board better be a stripper. I took a cab on the return trip. On another day, 15 were at a table (14M + 1 F) and during a break the all male crew were joking about stuff that by default excluded the lone female from the discussion. All these companies want to be "disruptive", but real disruption doesn't come from a vanilla exec team. Diversity is a strength not to be overlooked.