Martin Shkreli (the pharma CEO who gained fame after jacking up the price of a drug by 5000% overnight) is referred to in the press as "pharma bro". What makes him a "bro"? He's awkward, unpolished, and more resembles the overcompensating nerd from high school than the binge-drinking football-playing jock who got invited to the parties.
Tech has never had a "brogrammer" culture. The term is just used to paint the picture of programmers as being misogynistic.