Between two cultures, the body language and customs for aggression/anger in one are very similar to the flirting/courtship of the other.
In this scenario: An aggressive display is mistaken for flirting.
She got into the human’s personal space. Closed her off from any escape. Rumbled in a low threat, “I like your face.”
The human bared her teeth and uttered a barking call. Then she pressed her rubbery mouth to Hoq’a’lu’gi’s face. “I think you’re cute, too.“
Her ship-companions were correct. It was very hard to start a fight with a human.