Wearing flip-flops in the office

I thought it might be possible to tackle this from the health & safety guidelines standpoint, but unfortunately at least in the UK there's no paragraph for flip flops!

Let's explore what disgusts you. The sight of bare feet or something else?

If we start dictating what people wear on their feet, does that lead to an office dress code? My perspective is that people can wear whatever they feel comfortable in as long as it doesn't offend co-workers or guests. Vizzuality has never enforced a dress code and in my opinion that is a perk of working here. It should be down to the individual what they wear in the office and use their common sense to decide what is appropriate.

The first decision we need to make is: is this an issue bothering lots of people? Maybe a poll or consensus approach to decided if we should discuss further?

If we went with a consent process, what would qualify as a principled objection to wearing flip flops? I struggle with how much weight an opinion must have to be worthy of being considered principled. Examples:
1. I find flip flops offensive on grounds of my religion
2. I find flip flops aesthetically disagreeable because they expose callused feet
3. I find flip flops distracting because they are too relaxed for a working environment

Or, 4. the 'slip slap' noise they make as people walk is distracting.

Which then might lead to the banning of hard soled shoes because the 'clip clop' noise is distracting. And then we'll all be policing each other's choice of footwear instead of getting on with our jobs.

I've come to the conclusion I have no idea what decision process to use for this.
But more questions: what's the scope? company wide or Madrid office?

Thanks for your comments. As there is no any current guideline that could apply to dress code, I'll move forward and open a proposal.