This type of guy tries to explain to you the task at hand used to be done in a matter of hours when he was still coding himself, and does not understand why it can’t be the same now.
Yead grandpa, I know, I’m stupid. So here you go, here is the keyboard, show me your skill so I can learn from the best!
(Actually the best manager I ever had was really technical and was showing and teaching me stuff in a peer programming fashion!)