I've never understood why this is so reviled by like, everybody ever. Sometimes due to weather socks are appropriate but maybe feeling to lazy to tie shoes, so you just put on sandals instead. I did this once. One day many years ago I felt like shit, so my parents took me to the doctor (I don't even remember what for or what happened at the doctor). It was the winter so I needed socks but I felt like shit and was in no mood to put on my regular shoes so I just slipped on some sandals.
I don't know about you, but my whole childhood, my parents got me socks that went way above the ankles. It was all I knew and therefore normal to me. Everyone in my family wore socks like these. All the other boys I knew wore those kind of socks too. I remember one time I noticed that the girls were wearing socks that go way above the ankles too except they rolled them all the way down as far as they could go before their shoes got in the way. Perhaps this a female thing? It wasn't until a few years ago my dad pointed to the virtue of ankle socks, but only for warm/hot weather. During cold weather i prefer the shin (or whatever) socks.