Ok....
Two groups of friends, independent of each other, differing opinions:
Set one (let's call them 'the filthy's')
Belief: Feet are 'self-washing' ie by virtue of just standing in the shower, feet are washed (self cleaned) by the bubbles from shower gel flowing over and around the feet (no interaction required)
Set two - (and we'll call them 'the clean beans')
Belief: feet (and soles of feet and nails) need active washing/cleaning, not just passive bubbles flowing over the top and around
YANBU the clean beans
YABU the filthy's