I've experienced this way too many times, and the best example I can give is a person who treats you like you have no idea how to do X and who keeps teaching you how to do it. I feel handicapped.
Take for example how to play a card game. You know how to play the game because you've played it 5 times. However, there is a person always insists on explaining the game to you – like you are always new to the game – when you don't actually need any help and you just want to think for yourself.
Another example situation is doing a repetitive task which you already have experience with, and yet the person continually tries to 'teach' you when you don't need help/already know how to do it. It almost makes you mad because you really don't need help.
As an example which recently happened to me:
"Hey, do you remember how to start the wood chipper?"
"Yes I do"
"Okay, well, let me show you one more time"
Again, is there a term for someone who does this?
Best Answer
The closest word I can think of is pedagogue or pedant who is a teacher too interested in small details and formal rules.