Good day/Bad day? You be the judge!

I am working on a personal mission to handle my daily frustration. Why is it that you feel so much better if you can just let loose your daily grind-ation on someone else? Sure not a great way to make or keep friends. Oh yea, grindation is my own personal term for the stress you feel from working hours and hours on menial tasks without a mental break. Some goober once told me that he didn't think 'mental work' was tiring, and that someone who wasn't lifing heavy objects or doing rough manual labor outdoors had no reason to be tired. Your thoughts on that? I think it's a load of BUNK!