Have upper management crack sexist jokes, and HR laugh with them, so that women at the company who are sexually harassed know reporting it will do at best nothing, and at worst risk their own career.
Only hire young men in their twenties, and praise the idea of working long hours. Child care is for their wives to do.
Create artificial deadlines, that have no real-world repercussions for missing. But make it an urgency that must be done, instilling stress, and causing people to work long hours. Then after the deadline passes, note how it was unimportant, and repeat.
Have upper management make engineering decisions without accepting the input of engineers. Then when things blow up in a manner predicted by engineers, blame the engineers.
Pay new grads more than you do women engineers who have been at your company for years.
Have interviews that are focused on sports, and how much fun you would be at a party.
Praise the management style of Jeff Bezos and Elon Musk.