This is not really an AIBU because I don’t think anyone will say I am BU (challenge accepted, i hear you say!), but more of a ‘join me in clutching our pearls’.
I was on a short flight today, one and a half hours, and a woman across the aisle from me kept letting her toddler (under 2yo I’d say) use the potty in his seat. He peed twice in the potty before we even took off, then went to the toilet another 3 times and two more little pees in the potty in the seat again. Every time he peed in the potty she would soak the pee up with tissues and clean it with a wet wipe (it was very small amounts of pee each time).
I don’t know why she didn’t just put a nappy on him. He was very young and didnt’t really seem toilet trained. Peeing in a potty on the seat was just grim.