As long as you aren’t walking through literal shit and garbage and dirty needles it’s fine. People are irrational about bare feet beyond reason. The history and eradication of foot borne parasites is the history of irrigation, not of shoes. You are very unlikely to get a parasite walking around in an area with sewage kept off the streets. The more calloused your feet are, the more protected you are too.

You know where fungus loves to grow? Warm, moist environments like sweaty shoes…