You don't see that riding barefoot. I was on a good, single-speed (non-chain-hopping*) bicycle, and I felt safe. It was a beautiful hot day, full sunshine. Along the Ooijpolder dike between Ooijpolder and the big river Waal; it seemed right to go barefoot in a pair of shorts. I didn't want to stop anywhere else, only to go there, meet my girlfriend K_, and likely ride straight back to Nijmegen (which we did.)
[... The girls laughed at me....]
The Dutch would not generally ride barefoot, because the Dutch would not generally ride barefoot.
It's a very conservative cycle. This, in a country renowned for being progressive and open. And it is. But strangely traditional.