It's something about how human's rules are different, and if yukkuri won't follow human rules then humans don't have to follow yukkuri rules, so the house declaration is void
Even unsanitary stray won't even feels like this you know!?Uwoh!? Reimu's skin feels dry!!Are you alright ze?You shut up.Shut uuuuup!!Yes, yes, that. If yukkuri doesn't follow human rules, humans too will not follow yukkuri rules.
That's why home declaration has no effect against human opponent.