@terisky If you're stuck with a child permanently and no partner that'll help you you'll literally have no choice but to leave your kid alone then and again. Surely that's perfectly reasonable and something all parents do; especially as she's pointed out that the kid is usually perfectly fine.
If anything it's another black flag to the dad that's he's immediately insinuating some blame on the mom. Ya, well, let him try look after a kid and see how long he'll be able to keep up a 24/7 surveillance ... ^^