<human>: Can you condense the text into a few key points?

I have this coworker that sits in front of me at work that constantly has technical/software related issues on his computer.  He will look my direction and say something along the lines of "My Excel application is not showing the correct number. Can you come see why that is?"  I go to his machine and try to provide some input as much as I can.  During my troubleshooting he will make a comment like "My machine at home works perfectly but not here." Then adds "This stupid thing needs to be thrown out the window!".  Every once in a while he will say "At my old job it would work so well when I used to do this same type of work back in the day".  

The comments vary and I am making them as generic as possible but I feel like his call for my attention for help and him mentioning how he "used to" do things is some type of challenge to my intellect.  It has gotten to the point where I am irritated when he looks my direction and I feel like giving him short answers just for him to figure things out himself.

I don't want to come off as rude but I really hate when older folk feel like they know more, yet they ask for help and when they get help, they make comments about how it was better back in the day.  How do most people deal with this type of situation?

Thanks for listening!
<bot>: Coworker asks for my technical expertise daily but provides his own solution while receiving assistance and I feel like I am being tested!