Is it bad manners to wear shoes inside?

from w
Our family custom is always to remove shoes at the door and never wear shoes inside a house, but of course in Australia many people just leave them on. In the South Pacific islands, I guess because of mud and rain, people are always barefoot inside a house. The other evening we were sitting yarning at a kava party - some sat down, some sat up - and I noticed C's strange socks with eyes staring at me. I couldn't help myself - I just had to draw them. So, is it rude to draw people's feet when the conversation starts to repeat itself and go in circles?