Maybe that statement was a little too general or rigid. There are going to be plenty of women who shotguns will work for, for home defense, but as a rule of thumb I would much prefer training them on an AR-15. While my wife can, my mother can't. Most of the women I've trained to use whatever gun...
Semi-auto 20ga is probably the best if it has to be a shotgun. Semi-auto because it dampens the recoil. I did get some of my older aunts to shoot a 12ga semi-auto, but I had to help hold it up for them until just before shooting. I highly suggest not using a shotgun for women if it can be avoided.
I was 14 when Katrina happened and it was a major impact on my views. I have family in the area that were displaced from it. My parents and I went down to help tear out drywall from their place after the area was safe again. Grocery stores had just started coming back to the area and MREs were...