250 means fool. Is it universal?

Not necessarily! I heard that the origin of 250 is half-assed. In ancient times, 500 copper coins were called cranes, and 250 copper coins were called semi-cranes. Half-baked, not enough, not enough, such as lack of wisdom, not smart enough, and so on. Later it was also called 250,250. It is more serious than the dialect "80%" in our hometown.

There is no such concept abroad, and it should not be as common as the US dollar. ^_^