Its the same type of idiotic comment under any tiktok/short/fb video from any kitchen when chefs work without gloves: „EeW, UsE glOveS!!11“ That tiny amount of dirt wont kill you, but definitely keep your immune system in working order

The issue is not the literal dirt. Dirt is fine. The issues are the pesticides and industrial contamination like whatever's on the floor of the packing plant or grocery store.

Plenty of ways to keep my immune system updated providing myself scratches and cuts while mountain biking / trail running, let alone eating snacks while on the trail with my hands absolutely not clean, or by simply breathing in a forest.

But ingesting the black residue from exposure to diesel smoke while in transport is not for me, thanks. Feel free to train your immune system to dispatch tar.

Has anyone else seen oranges encrusted with this black residue from diesel smoke? It's not an issue in my country.

Have I written encrusted oranges?

There can still be bacteria or viruses on the produce, generally for people with weak health it is recommended to wash all the produce they consume.

There are also many *-icides, but they are generally quite hydrophobic so it's not easy to wash them off.

But you are right about the dirt, there is even some evidence suggesting ingesting some dirt may be good for your gut health.