I've been thinking a little more about your comment that I can see Thranduil hating dwarves for the same reason Celeborn does, since they are both from Menegroth. How old do you see him being at the time of the Kinslaying, Elliska? For some reason I have always thought of him as relatively young when that happened, so I always imagined him being a child perhaps traumatized by orcs, without really making the connection with the Dwarves (at least on a visceral level). But you're the Mirkwood expert, not me, so that head-canon may not be accurate.

Certainly when it comes to Celeborn, he had other issues that would contribute to that antipathy toward Dwarves. He seemed to distrust Khazad-dum back in the Second Age, and it was a balrog awakened by Dwarves that led to his son Amroth's death. Thranduil, on the other hand, had all those centuries of Erebor as an ally against orcs and spiders to dwell on. Be seems to have a history of living side by side with them, at least the way I read the Hobbit.