Brushing Your Teeth at the Urinal

So I was using the urinal at work today, when I realized that the guy at the adjacent urinal (don’t worry - these have a very large partition between them) was brushing his teeth. At the urinal.

Is it just me, or is that a little gross?

I’m going to go on record here and say that it’s a breach of etiquette to be brushing your teeth at a urinal, or a regular toilet for that matter.