Only highly acute sensors can fight eyes closed... Toneri isn't a sensor and his arsenal revolves around being able to target which let's face it, he did pretty haphazardly with his eyes open.They've also never fought against genjutsu users, so why would they? Point stands, if his eye lids are closed, all forms of genjutsu outside of sound genjutsu become useless, since visual genjutsu needs the opponents eyes to work.
Now that's a satisfying word.