I think you are overplaying the perceived insult/rudeness of the description.
Most of the derogatory nature of the description was aimed at where they live, contrasting what Aurvandil would consider "squalid forests" to the "urban refinement" to Candiels, or the plains of Zerujil, which is what Allomere wrote. Aurvandil are very much urbanite's as opposed to rural peoples, and that is what Allomere was getting across, we like our civilisation to be in stone, to cut down the nature around us. He never especially directed any insults against the nobles, or the quality of the civilisation, only stated that due to its climate and environment, he believed it to be squalid in contrast to Aurvandil's stone metropolises.
