Sentence:  Zumbo, realizing that he had misjudged the popularity of the AR-15 among his readers, apologized. But by then nobody cared what he said. Zumbo had become a <WSD>Fudd</WSD>. 
Meaning of the word marked with <WSD> tags:  A gun-owner who supports traditional hunting guns but favors gun control for other guns such as handguns or tactical rifles.