Wingnuts threaten professors

This may be one of the more chilling things I've read recently. A professor posts a criticism of a wingnut's claims; next thing he knows, he's getting threatening letters.

Part of the response to Aaron Barlow's critiques of the evidence used by the site was this:

Professor Barlow, I do hope the rhetorical methods you have employed on this Web site do not reflect your behavior in the classroom. When your students present you with evidence which you find tiresome, annoying or inconvenient, I hope you do not simply pretend that they have failed altogether to provide you with any evidence at all - and then grade them accordingly. We take a dim view of such practices around here.

Shortly thereafter, he received an e-mail asking where he taught.
The story makes my blood run cold.