For me they were always out of style. I don’t wear white socks not even for sports and I can’t remember ever using them. I think I would only accept it, if the person was wearing white pants and white shoes (which, for me, is also not acceptable). I also think it has to do with calling for attention, by clashing amongst other colours.
But going back to fashion, if they’re white socks then it’s got to be those that have the tennis rackets – a great classic.