As to why 99% of bricklayers are men, you'd have to ask the women why it doesn't appeal to them (IIRC, Whoopi Goldberg did it for a while, so why not ask her?). Its hard, physically demanding work, and can be tedious. I'm in the construction business, and I have to say it doesn't hold much appeal for me as a full time job, so its not hard to see why women don't gravitate to it.
In Very Large Part it is due to the atmosphere of 99% male workplaces being bastions of harassment. No matter how much you like your work, no matter how good you are at it, it sucks to work with people who treat you like shit Every Single Day. And that’s why management has to make it clear that they expect a change.
Also, your assumption that men and women are equally good at bricklaying needs some work. Take engineering as an example. Make it engineering in the 1980s. Make it Chemical or Mechanical which were 99% male (as opposed to environmental). Now think about how of the 99% who are male, there is a very large chunk who “fell into” engineering because they didn’t know what else to do and engineering is a manly job and that’s all they really know about it. The 1% of women, tghough, not a single one got there except by being intensely interested in the exact curriculum and deliberately working past difficult barriers to get there.
Odds are, that EVERY ONE of those 1% of engineers who are women are in the top 5% overall in skill, interest, knowledge and fortitude.
They don’t drop out for partying, they don’t skate by with Cs and Ds and get whatever job. They are On A Mission, and they have already passed fifteen side-quests.
You can assume the same for all of these diversity battles. The lazy and mediocre minorities don’t shoot for the challenging roles; there’s too much extra that they’d have to fight. By contrast, the lazy and mediocre majority don’t realize these are challenging roles, they just feel entitled to participate.
Think about that…. “All things being equal” has never yet been true.