Seems that this thread is divided between those who are determined that leggings are only for practical use (you could argue that once upon a time, they were…) and those that are aware of more recent trends.
Op, if your dh was referring to ‘all’ women, including those in cheap, slightly saggy and baggy at the knee market stall leggings, who are clearly wearing them for practicality and comfort, then he was being a misogynistic creep.
If however he was referring to the type of woman who is typically young, well groomed, toned and aware of being sexually attractive, in those butt clenching leggings that have been designed to accentuate, usually worn with a cropped top and often worn around places like IKEA and the supermarket and not just the gym, then he may have a point.
My dd is one of the aforementioned young women, she is very aware of how good her bum looks, to the point that she likes to critique it at all angles and take ‘progress pics’ of it. She likes to adorn it in the types of leggings that show it off to its full bouncy pertness which, in her words, ‘make my butt look sooooo peachy’.
It would be highly disingenuous to deny that some - not all - women wear a certain type of legging to show off their bottom. Whether they are doing it to impress men, women, or women and men, or just because they like to feel confident and good in what they’re wearing, is anyone’s guess.
But let’s not pretend that it doesn’t play into the hands of the patriarchy just a little bit.