I've been involved in various situations where something that, in objective terms, doesn't have a huge bearing on the ultimate success of the project but ends up costing an inordinate amount of time and resources and pure frustration.  And then someone will spout off something that sets me off because they underestimate the actual difficulty involved.  Perhaps it was minor, perhaps not.  And then, when I'm finished and am staring at them with baggy eyes and utter exhaustion and time invested that I could have spent doing something I actually liked because of the work I put in for their benefit, they are personally offended.

Those being offended should cut someone in that situation a bit of slack.