The response from this Duncan guy was probably unnecessarily rude, and while I mostly agree with the content of his response, he certainly came across as a bit of a dick.
That said, I fail to see why we should care. A person was part of a community until they had a snit and left it. Okay.
(Edit: As rightly pointed out below, the author was effectively kicked out of their role after complaining about said variable. So fair enough, I'm upgrading Duncan & co. from 'bit of a dick' to 'complete dick who shouldn't be in charge'. In which case we should definitely care about a project's admin abusing their power in that way.)