And found out the pepper powder had maggots in it.

It ended up being the best chigae I ate on my mission.

Would I expect another salad if I saw a fly? Sure.

But a free meal? It'd be nice, but no way would I feel entitled to it. And walking out!? That's over-reacting.

I bet the manager said to the waitress, "you did just fine, some customers are entitled and there is nothing you can do to please them. Carry on."