- "ignored ... a carefully worked out explanation"
- doesn't (or doesn't care enough to) understand the company's established processes ("...or something")
Given that s/he thus didn't (couldn't) relate these in his/her telling of the story, there's at least the possibility that what's missing is less flattering or even completely contradictory to their telling.
Just as we can all point to examples of process absurdity, we can all point to examples of
- failures because process didn't exist
- companies with good process
At the very least, from an objective standpoint, the poster's telling of the story reflects poorly on them
The "or something" and "which I ignored" aren't making you look like the reasonable actor in these interactions