[NSFW?] People who don’t flush, what do you think of the offenders, or the worse situations you discover they have left?

[NSFW?] When you go into a restroom and discovered the toilet not flushed how do you feel about that? If it happens in a public restroom do you view it the same or different if it happened in a private residence? If so, if it was a home you visited would it be different than if it was a visitor that did it in your home? Does age give the person more slack, say if they were a toddler or someone newly bathroom trained? Regardless of where it happens is it the same or worse if they leave……ahem….chunks, or solids? If it is a private residence, yours or another person’s, do you say anything about it or just grin and bear it and flush it as best you can without being grossed out (if it does that to you)?