Well, I'm 40 and been to my fair share of concerts and fests, never even heard of people shitting in the crowds so they don't lose their spot. Heard of and seen a sneaky piss some where or some genuine runny accidents. I've yanked my own broken nose straight at the edge of a mosh pit but I've never heard of people shitting their pants to hold a spot, nothing near creating a public shitting trend so bad artists are addressing it prior to their show.
Back in my day this wasn't a thing; you kids are weird.