I can definitely see wearing socks with those. Now I do work with a fellow who wears his steel toe boots without socks in summer. I've seen him take off his boots and put on rubber goloshes without socks. I never wore flip-flops. I prefer fisherman style sandals, and I wear those a lot here in AZ. I like the closed toe and secure strap closure. And, yes, I wear them with socks.
Hiking in the Smokies, didn't the Crocs pick-up debris through the large openings and onto the footbed?