That's the traditional korean chopstick. We used them at home.

So do we.

Disposable wooden chopsticks were preferred in korean restaurants
(in korea) over metal ones, because it's not re-usable and thus
feels cleaner.

Nonsense.

I'm a bit surprised that you were given metal sticks in korean
restaurant. Korean people don't like that.

That's not true!

Everywhere in South-Korea, metal chop-sticks are used in each and
every kind of *real* restaurant, in small and unexpensive as well
as in expensive ones. And we never met anyone there who wasn't Korean.
Bye, sanne.