[Armin responds with a small sigh, looking more tired than he looks upset or annoyed at either of the angry two. Jean and Eren had argued with each other all the time; Jean had snapped at almost everyone during their three years of training; it was nothing new. But when they yelled at each other for not being able to understand their languages...]

It appears so. It might be how they communicate. Still, I think it'll only be a matter of time before they both get complaints about the noise..

[He doesn't even flinch at Whirl's glaring, not even responding because he has no idea what Whirl is saying.]