There’s the saying: “if it’s yellow, let it mellow; if it’s brown, flush it down”.
I was brought up to do this at night time if I needed the toilet, to minimise disturbance to other family members. I always wonder about the etiquette of this when staying with others.... not something I do much, but maybe once or twice a year. AIBU to think I shouldn’t flush the loo at 3am for a wee, or is this gross. I’ve tended to flush in these situations as hadn’t wanted to be seen as mucky, but is this unnecessary?