I used to hate jeans, I thought of them as scratchy and would only wear handmade pants my grandmother made. Somewhere along the way I grew to tolerate jeans but for the past 10 years I really rarely wear them. I like sweatpants, they are comfy.
Last night we were actually leaving the house (the amazement!!) so I dug out a pair of size 8 jeans. Now keep in mind I got these like 15 years ago so at this point they might be actual "size 14" jeans with the way the clothing industry keeps changing. In any case I survived in them for maybe an hour or so but then they started to really hurt in the (ahem) crotch so I actually bought sweatpants at the Sears we were at and changed into them in the car for the ride home
So that taught me a lesson not to wear jeans for the next 10 years.
And yes I had tried to go buy a "current" pair of jeans a few months ago and they were so AWFUL looking, at least on me, the muffin top look indeed. I kept thinking something must be wrong with the sizes I was choosing but really, none came up to my waist. I definitely don't like them coming across the hips like that, and I agree, when I see girls wearing them it looks like they are sliding off. So to me that looks like they "don't fit" but I'm sure that's a big part of the appeal, is that they look sexy to guys like "they'll slide any moment now". Sort of like how girls like to wear tops that look like they're about to slip off.
So I think it's a sexy thing of "about to fall" rather than a "looks good on"