Another tempest in teapot.
I don't find it much of a stretch that someone might actually say something like that at all. People speak all manner of ill when they're upset about something. It's like the petulant child wishing harm upon their parent because they weren't given any ice cream. After a period of reflection do they really mean it?
However most reasonable people expect that adults are held to account for what they say to a higher degree than children and professionals to higher standard than the average Joe. Therefore such a comment will not be met with the sort of empathy the person uttering it might have expected. But based upon the sorts of garbage I've heard spouting from angry lips in my lifetime I have no problem believing someone said such a thing. Though I do have a feeling they wouldn't say it in public!