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Andorian headcanon that they read each other's emotions not just by facial expressions and body language but by their antennas as well. It's an entirely separate way of communicating with each other.
All this to say that Shran constantly finds conversations with Archer both infuriating and exciting because on one hand he's frustrated that he can't understand his pink skin because there's an entire aspect of emotional understanding missing and on the other hand, he's finds that he likes the mystery of it all, each meeting between them is a new game for him to figure out how humans operate and express themselves.