Importing stone is also very expensive so its not illogical to imagine that in an area surrounded by trees there would be a large ammount of wood used in ALL construction be it fortress or outhouse.
Also, why is the politeness of a war declaration roleplay which suggests the ENEMY is lesser than its authors such a matter of contention. It is almost certainly a propaganda roleplay.
Well, they live in a forest that stretches for thousands of miles in in-game distance, it'll be very hard for them to import stone, if they don't have their own quarries, which Barca may well have and would well be in within reason for them to have. Though, it stands to reason Barca would use wood simply because it's cheap, easy, fast and quick to repair, can stockpile large amounts of it, and you can construct wooden walls or ramparts in a matter of hours. For sections of Rettleville that cannot be approached except for climbing (If the drawing on their wiki page is to be believed) then it wouldn't make sense of them to shell out a vast amount of time, effort and gold to cover it in the same standard of stone fortification when it would be just as easily, if not better defended by wood.
The roleplay never exactly said anything overly offensive or insulting, or at least Barca so far never made a fuss about it, corrected Aurvandil on any inaccuracies.
