@ChrisPerkinsDnD
Volo's guide talks a lot about Kobolds' relationship
to Tiamat and Chromatic Dragons;
But what do they think of Metallics?— MadHatterHimself (@Madhatterhim) December 13, 2016
Kobolds don't relate to metallic dragons like they relate to chromatics. #WOTCstaff https://t.co/8E3uF5YSps
— Christopher Perkins (@ChrisPerkinsDnD) December 13, 2016
I feel that the answer is a little vague. It could mean anything from ‘mortal enemies’ to ‘less favourite’
Although I suppose the message here is one that is frequent in these sort of games: ‘As a DM, you get to decide. Its your world and whatever you think is best for the story you want to tell’.