So basically Reimu wanted her family to be taken in. Anon takes her in but only feed the children food and feed the Mother Poo-poo of her children. See how long she lasts?
Anon has been kind to let her go. He's an abyuser, but not really in the mood for killing yukkuri that day. Then this Reimu starts begging him more and more, making him annoyed.
In his eyes, this Reimu a good for nothing who act nice and selfless while in fact she has given up. More annoying than perfect scum who's asking to be crushed on the spot.
Yeah, seems to be the abyuse pattern that corrupt the family through luxury and discrimination or that sort. He did say that the children are nice, *for now*