"Can you stamp as hard on the brake barefoot as you can in shoes for an emergency stop? There's not as much friction between a bare foot on the pedal and a shoe on the pedal, surely?"
I've only ever had to do an emergency stop/hard braking a handful of times and it's never been when I'm barefoot, so I couldn't say either way. All I can say for certain is that my feet feel as secure on the pedals when I'm not wearing shoes as when I'm shod. I have had my feet slip once or twice, but that's always when I have shoes on.
"Both are against social norms though. Both are something a lot of people would feel uncomfy seeing around the shops"
The froth that people are getting into because someone prefers going barefoot in public is interesting, and the arguments just defy logic (and I'm not a barefooter BTW).
Dirty feet, yuk...shoes are dirty though aren't they. Feet are far easier to clean than the treads on shoes.
Dirty feet in my house...I understand that, but only if you also have a total shoe ban indoors too.
Sweat, toe jam...feet exposed to the air and allowed to breathe are not going to sweat like they would when wrapped in things that make your feet hot (and lock that moisture in), e.g. socks and shoes.
Might tread in poo or on glass...only the barefooter is going to suffer though so why does it upset others so much? I hazard a guess that if you go barefoot you're going to be a bit more careful not to tread in poo, i.e. that you will look where you're going? Easy to do at walking pace.
Health and safety in shops...people are allowed to wear flimsy sandals or flip-flops which only give a bit of protection to the soles though. If you get run over by a shopping trolley it's going to hurt unless your feet are totally covered. Flip-flops aren't going to help so why don't shops bad those?
If I saw a barefooter out in the streets I would be shocked because it's so unusual. I'd also think the person had some guts, not because they have to dodge all the poo and glass, but because so many will consider them freaks and be arseholes about it. I think the froth boils down to "you're weird and I don't like weirdos (and I don't want to use any brain energy having to challenge my thoughts on this)".