Chris angrily signing "I make my own paint, and I'm not even using lead white, what else do you want??" at Geoff.

for teacher Geoff... maybe Geoff doesn't realize at first that Artisan Freeman is Deaf and thinks he's being ignored? And then finding it out made him super embarrassed. Likewise, perhaps Chris misreads Geoff's lips at one point? Since Geoff doesn't realize he needs to speak slower... and it just piles on from there.