I have encountered the same attitude in a very small project I took over maintenance of.
There can be a degree of entitlement in users, I think even more so if they don’t know _how_ they can help.
Many of us have been under the gun to fix problems in software we haven’t written, and working through that can be challenging and frustrating.
It blows my mind that Richard both provided a fix and also caused the reporter to re-evaluate how he was communicating.