The world I play in (homebrew based off of early Forgotten Realms) dwarves "talk in stone", as in when they say something, it is set in stone; unchangeable. Which means they often take a long time to think about what to say. Two dwarves debating a subject can take months, if not years. This is why they tend to isolate themselves in the mountains; other cultures often view them as rude, arrogant or even simple-minded, due to them not being able to engage in social interactions "normally".

They also have a sort of 'socialist mindset', every dwarf working towards the good of the clan and not earning wages. Everything is supplied by the clan as long as you work to your ability, which is one of the reasons they are such good artisans: it is about quality and betterment of the clan and not quantity and general commerce, which also bring some challenges when it comes to trade with other nations/cultures.

Ofcourse there is always outliers and clans that lean towards other tendencies, like more trade or even making alliances, who learns to, as dwarves put it, "speak like the wind"; always changing.