I'm wondering how this started (definitely men's shoes first). Probably some fashion-foward kids in the cities who dug out their dad's trainers from storage in the basement after 20+ years.
Then the IT bros wanted to look like they were just as edgy, except they sit at a computer and never exercise or do anything involving running or sweating. But they do make way too much money.
Ta-da! Ridiculously overpriced smeggy trainers.