Well from reading the thread on DSLreports he seems quite knowledgeable. The same frankly cannot be said for the badmodems site operator. This guy makes a self deprecating comment (he called himself a moron) and is offended when it is repeated back to him. The comment from kevinds about "grown-ups" was not the most polite comment ever - but really if that was all it took this xymox dude definitely needed a change of scenery - for whatever reason he has ended up with a few screws loose.
I have participated in the forums of dslreports.com for years and kevinds is one of the more knowledgeable in various areas.
The badmodems guy seems to be upset that he is outsmarted, honestly. Thanks to him for the good he has done, but if he can't handle being in a room with others smarter than him, this departure is for the better.