They are always "in" as far as I'm concerned.
I wear black sneakers to work, since I do alot of walking, and no way I'm gonna wear black socks. At home, I wear another pair of black sneakers, and in summer I wear the over-the foot socks that don't show above the sneaker. In cooler weather I wear white socks, pushed down, with my black sneakers. I always wear plain white - no stripes on socks! Striped socks look dorky*.
I never wear white sneakers. And I hate black socks.
When I was still (barely) active as a jw, I'd wear white socks to the meetings. And I wore black high-top sneakers too, near the very end of my KH days.
*In the 1970s, the look was totally different. I wore white, striped socks, pulled up over my calf, with shorts that were very short. When I see film of NBA players in the 70s, I can't believe that look was actually "in". It looks totally ridiculous now.....and one day, it'll probably be back.