LOL... that comment is hilarious because it touches one key truth about Vietnamese culture...
When you ask a Vietnamese person if they can do something, they ALWAYS say they can, even if they have no clue what it is. Especially Vietnamese men. We have this weird need to always pretend like we know everything.
It's similar to the TV sitcom stereotype of how all men think they can fix a leaking pipe, even if they have no clue how to do it.