Rephrased, agreed, sorry for careless language.
I've heard that about marathoners before, but in my mind this is a bit more like shitting yourself at the gym than shitting yourself on a run. I don't need to lie down on the same ground that another runner has laid down on, nor sit in a seat that another runner has sat in. It's a faux pas not to wipe down 30 seconds worth of sweat on gym equipment, let alone extensive diarrhea.
Anyway that's my two cents