Athletic shoes have been predominantly white since I was kid, with the exception of some sport-specific ones like bike shoes, or shoes for turf sports (though many of those changed to white in the late 60s), so I don't really get that one. Street shoes, though, yeah that's pretty cringe-worthy. And white belts.
For me, the breaking point is horizontal-striped polo shirts like my dad used to wear. If I ever wear one, my wife has permission to take me out back and shoot me.