It seems like neglect in the first place... and that the parents 1. took pics of the kid's humiliating moment and 2. shared them with other people to shame him are red flags. The pic's sad...
Sorry I am bent on this... maybe I am too serious.
I think the only reason the parent shared this was because the child's face wan't in view, not to humiliate. It's just something some kids do, and all kids so crazy stuff! It's not that they do it because they plan to make a mess, it's that they maybe were taking a nap, and perhaps pooped and didn't like the sensation of it in the diaper, and took the diaper off, and then was like "oh, what is that IN the diaper" and then picked it up, it got on their hands so they think "oh let's wipe this off" and so rubbed it on the dresser. accidentally stepped in it, walked around, played awhile and then feel back asleep. It was a learning experience for the child. It's one of those moments where a parent has to laugh, or else they would cry! It's a total stinking mess! Parenting is messy, and yes, I laughed, really hard! (probably because this isn't my kid!) This child is too young to know better. There are cases of older kids doing it in schools, those are more likely special needs kids, but little kids like this do crazy things like this all the time. Luckily I have never had my kids do this sort of thing (at least to this degree!)
I wouldn't call this neglect at all. He is obviously in his own room, it appears clean, without choking hazards etc. Even parents have to take a shower at some times! You can't be glued to your kids 24/7, sometimes for your own sanity you have to be in the next room (or sleeping yourself.) These things happen, and seeing the humor in them is just a way people cope.