It is likely test like that was planned long in advance and peoples schedules were planned so that right people were available for the test.
If you spent a second thinking you might surmise there might be a reason. I did and noticed Space Shuttle launches happened typically on mornings which means they would be filled up overnight.
Telling people who are probably working their asses off to get things done that they are subpar because (because of what exactly?) I think is enough reason to be at least a little bit derisive about.
I added some additional information to point out there might be a good reason to do test at night since for example, SST missions tended to launch on mornings.
https://www.businessinsider.com/elon-musk-says-80-hours-per-...
If 'obviously' there is no night shift, and people had to adjust schedules for this, then this is an instance of "highly fatigued day crew". Because there is no night shift, none of the rocket workers are being insulted.
Also, 'petty' is a very bad description of their argument.
Also, the comment doesn't say there was no reason to do the test at this time. Obviously there was some reason. The comment is questioning whether the reason is more important than having the best engineers in their most awake state.