Is this really such a big deal that people are still going on a bout it.
We are cleaners and own a mid-sized cleaning business with 13 staff, we also charge a premium rate if that matters and staff are paid highly as a result of our premium business model (if that is a factor at all!)
We would never (and do never) allow clients to disrespect our staff in any way to the point where on the rare occasions this has happened we have terminated services.
As for a poo down a loo, I really just think clients are too busy to notice this on occasion and we all just shut the lid and flush before cleaning without further ado.
When I was the only full-time cleaner in the business I came across this, not often but it happens, I never even registered it as an issue. I've always felt treasured by the families I cleaned for and the cleaners on our team always report feeling this way. We do not mind flushing an occasional poo for them. It's not routine, it's not deliberate, it's just life.
Some of us love cleaning and made it our business, it might be tough, hard physical work and for a business owner a lot of mental juggling too, but at the end of it, we have good full-time jobs where we feel appreciated and one poo doesn't get to spoil our week. If anything can spoil our week it will not be a simple poo.