Seen this on reddit and thought it was an interesting question that largely is not talked about.
It is largely an issue that gets sidelined and hidden because people don’t want to talk about it or accept that it exists. Hopefully this gets some traction to break that marginalisation.
I’ve almost never actually seen it, but it’s BAD when it does appear. Had one boss tell me straight to my face that I was going to be useless because I was a man. She did all sorts of really petty stuff, like removing the clock from the break room and chewing me out for being ~30 seconds late coming back from break. Lost that job in less than a week when she literally lied to the manager that I never showed up for a shift. I could have easily fought and won for the job back, but I just didn’t care at all and spent my effort on more fruitful things.