That's EXACTLY what my husband said! Cats don't just drop and poop in the middle of the yard. This neighbor said they've found poop in their planters even! Sorry, but none of our cats have ever gone to the extreme of climbing into a planter to poop!Maybe it's not the neighborhood cats leaving the poop. Other animals leave it, too, like skunks, opossums, and raccoons. Cats usually cover up their poop, so if it's left in the open, it's probably not a cat. I've seen people mistake Canada geese poop for dog-do. They look very similar. You might point this out to the unfriendly neighbor.
This guy is a bodybuilder at about 6'3 250 lbs and he can't manage to pick up some cat poop (or whatever kind of poop!) without whining about it to all his neighbors who have cats! The guy has spoken to me once, and that was when I dared bother to introduce myself to him and then has no issue coming over and complaining about cat poop. Same with our neighbors. He talks to them once when meeting them on a walk and simply says "Pleasure" when introduced and nothing else and then has the nerve to come over to them to complain about their cat and saying that "This one is a freebie warning, next time I'll have animal control issue a ticket". I need to send an email to the city asking what the whole deal is with having evidence of a cat pooping in your yard and fines.