This is so common that it is not Epic Fail. Not even Fail. It's simply fortress life. Failed moods are common in every fortress. An epic fail would be walling them in, but accidentally forgetting to lock the door, and having the berzerk dwarf run through your fort, a Legendary+5 miner with a steel pick bashing the skulls of your trained military and pulling the levers that flood your noble's rooms.
Come back with more bloodshed.
Do not pick a fight or insult another poster.
It kinda sounded like you were trolling there.
It sounds like
you're trolling here. That, or whining. It wasn't meant to be a direct insult or anything; she was describing commonalities of dwarven life vs. failure and bloodshed. (The two tend to intersect quite often.)
More on topic, that would be an immense failure from the dwarf's point of view.
Spend all of your life doing simple and mostly meaningless tasks. One day, sudden inspiration strikes you. You may very well make one of the best items the world has ever seen! The thought literally possesses you.
You get to your workshop, material list fully in mind. But the materials are nowhere to be found! It's too late to turn back, though. You must wait for what you need.
While you wait, a wall is erected around you. You barely notice. The madness is starting to consume you.
After a time, you can't take it anymore. You lose all sanity, the need to live gone now that you can't make this amazing item. You rot away the rest of your miserable existence in this walled workshop.
It seems to be a pretty epic fail when you think about it that way.
Amusing when you consider how often failed moods happen.