Our DM was also very adamant about this issue, bringing it up to the whole group several times during the dive briefingOur DM Spider was adamant about no touching of ANYTHING under water. There are and always will be unintentional fin kicks or touching from even the most neutrally buoyant diver as long as they are close to the reef. Only way to avoid touching anything is to stay far far away. But then you don't get to see the little stuff.
Sadly there seems to be a plethora of divers who are just unaware with no situational awareness (I'm speaking here more about local diving that what I saw in Bonaire). Hopefully they are open to gentle reminders of paying attention to the whole body all the way to the fin tips.