Extreme nepotism and sexism in promotions and opportunities. Managers and directors are often married to other managers and directors. They socialize together, been to each other weddings, their kids go to school together.
Good old boys club is rampant. Men can act
unprofessionally, tell off supervisors and they are hailed as "great leaders" and "keeping it real" if women act that way, they are abrasive and bossy. Men can take long lunch break, over commit to projects they don't finish on time and they get "exceeds expectation" in their reviews. Women work twice as hard and get none of the credit. Take a short break and your supervisor gives you the stink eye.
The truth is it's a deeply ingrained "good old boys" club and you're not invited.