The little web site that has Fox News fumingLegal threat over spoof T-shirts rouses $ support By Jim Jazwiecki As a TV news operation, Fox News Channel prides itself on the give and take it offers viewers. But that can't be said for its legal department when the cable news network is the subject of some of the jabbing its on-air talents relish in. Recently, the people behind Agitproperties.com, an Austin, Tex.-based activist web site, received a letter from Fox lawyers insisting that the site stop selling T-shirts making fun of the News Corp.-owned channel. One shirt reads “Faux News:...