Rocky dumbing down his speech for Grace only reinforces the idea that Grace is a kid in the other Eridians eyes and multiple conversations are happening at once..
Eridian scientist: why did they send a baby to space?!
Rocky: Grace is not a baby. He’s a fully grown human and you all need to respect that-
At the same time another Eridian: the human is thirty!! Are you COMPLETELY sure he’s not a child? He’s barely coordinated!
Rocky: Grace is very sick!! Of course he’s not coordinated you fucking idiot-
ALSO at the same time: did you not think to teach him how to understand us properly?? Let alone communicate with us.
Rocky: he doesn’t have the vocal cords for most of our sounds!! And we were WORKING on him being able to understand proper speech but he’s delirious?! The fact he’s conscious is a miracle-
Grace who is visible stressed and half covering his ears but also trying to listen: what’s going on?? I can’t hear you guys it’s too loud- Rocky what’s going on?!
Rocky: apology apology other Eridians ask dumb dumb dumb questions, Rocky tell Grace later. Grace sleep now Rocky handle.
Grace just nods with bleary eyes and knocks out almost immediately, and the other Eridians are giving Rocky the equivalent of a raised eyebrow in unison.