Do as he says, not as he does Klaus. Five never claimed to be a prime example of behavior, he just complains like an old man when bothered. Feeling like his lungs are on fire and there's someone hitting his brain with a hammer doesn't help matters.

"It's the stupid sneezing." Five explains in the end because he wished that could just stop once and for all. Part of him is very glad that Klaus is staying close. When it had been only him and Dolores, there was really no way to get things done or search for food if he got too sick, now at least had someone to rely on, albeit begrudgingly.

"Yeah? Let's...not try that." The boy's voice is softer this time as if he is brushing off Klaus idea but doesn't want to do it too harshly. He is well aware of the reasons why his brother does what he does. If he were seeing annoying ghost all the time, he wouldn't spend a day sober either.