The issue wasn't an occasional mistake done in good faith. The commenter has decided to explicitly dismiss contribution guidelines, and for that the healthy response is to call out their lack of respect for the time of open source maintainers. The focus wasn't on emotional burden either, it can simply take a lot of time to sort out issues and pull requests that do not follow contribution guidelines when you maintain a popular project. It isn't a bit of house cleaning, but hours wasted every week, depending on the project.