As the resident office "IT Genius" (and the only man on the team!) I sometimes get a touch exasperated that I need to keep explaining how to do simple things like keyboard shortcuts and how to do a screendump or partial screenshot when logging calls with the Help Desk - not because my colleagues are incapable of learning how to do it themselves or are slow or anything, but because it's easier to get someone else (me!) to do it than to remember how to do it themselves.
As for 'mansplaining', it's down to some people thinking you can tell them in half a dozen words how to do something you have spent years learning - partly due to the short attention span/infodump culture necessary to watch (normally but sadly not exclusively American) TV shows and partly because they think shows like TOWIE or "Real Housewives Of..." are how the world really works...