As you know, during the Arms Dealer strike, as you make your way to the Orobas Vectura(the cabal carrier), Cayde says that he is surprised that Bracus Zahn hasn't painted the carrier Chartreuse to match his armor. Upon hearing this, Hawthorne says "I'm sorry, painted it WHAT NOW!!!?"
This prompts Cayde to recall what he said, so Hawthorne was very serious about this. But why? What is wrong with the color Chartreuse?
Edit: Ok, I think I understand now.
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It's because most people would just say green and not even know what chartreuse is, so Cayde calling it chartreuse instead of green caught Hawthorne off guard which is why she replied that way.