The Millie is the one knife that I've encountered that's made me think hard about adopting a back pocket carry. I'm sure some day I'll own one!
Addressing the larger question of carry: My problem with carrying on the zipper side of the pocket is access. I don't know about you all, but most of my pockets are naturally deeper on the zipper side. Anything in your pocket tends to settle there. With a knife clipped over them, you have to reach around the knife to get to keys, change, etc. Not only is this awkward and drags whatever you're retrieving across the knife, but if that knife has a flipper tab, its easy to snag it while coming and going.
There's no absolute right or wrong way to pocket a knife. It's fun just to read the different experiences we all have. I know we tend to have this same thread once a month...I like to think there may be a new member
this time who'll learn something to improve their knife experience. Face it, a tip down flipper with a weak detent or Assisted Open IS a hazard if carried in the outside RFP. That's a recipe for disaster that can't be shared often enough.
And, OP, sexist jokes aren't jokes anymore. They're just ugly. I'm not trying to sound all "correct", but if humor requires putting down a different group of people, you need to re-examine your humor.