Fear of the harmless.
(Based on experience with Harm-OCD)
The new human on board came highly recommended. They left every area they worked in cleaner and safer than it was when they started, seemed to always find and fix issues before they ever had a chance to become a problem, were quick to talk down anyone that started to become angry or frightened, and even seemed to never have issues with Silly-Seasons. The only issue was that they refused to work with Havenworlders…
Anytime they were around Havenworlders they would become quiet and place their hands behind their back. While never directly rude they would take any excuse they could to leave and often would never directly look at any Havenworlder near them. This gave them a unpleasant reputation despite being highly regarded for their skills.
This continues until a Havenworlder tries to bond with the "quiet human" by silently sitting next to them while they are reading. The human upon noticing the Havenworlder jumps away hard enough to knock the Havenworlder over. The Havenworlder is unharmed but the human is now obviously panicking whispering "I'm sorry." to themselves repeatedly.