Thrrak: What's this nonsense?! Get me an ale! All dwarves drink ale. And bring me a second before I'm done with the first!
Thrrak's family moved to the human city, and the only dwarves he knows are his family. Like any good expat, he's taken what he assumes to be dwarven traits to the extreme. As my DM says "so when you show up in lederhosen all the real dwarves laugh at you..."
"Aye, lads, real dwarves drink dwarf spirits! Though be careful. I once saw a lumberjack give it a sniff and fall feint! It took three clerics ta revive him! Imagine if he actually drank the stuff!"