Double post much?
I imagine quite a few voluntaries have that sort of mindset. After all, the target audience of The Sharing is people who are essentially train wrecks, depressed, druggies, loners, etc. I'm sure the Yeerks are briefed on the possible mental conditions of the host. Nonetheless, experiencing it is probably a bit different.
I imagine it depends on the Yeerk. Most Yeerks probably would be able to ignore a host like that. However, if the host has a physical condition based on chemical imbalances and whatnot (such as chronic depression, ADD) that may affect the Yeerk as well.
Haha. Imagine a Yeerk with ADHD? Oh dear.