Take the iPhone 6 thread for example. We have a bunch of Android users in there seemingly with a purpose to promote Android and put down the iPhone, but at the very least they came up with explanations as to why their opinions exist. And that's respectable. A bit of banter, discussion, corrections, etc. but in the end a pretty civilized discussion.
Anyway, someone who spends three quarters of his time on the forum going into threads about things he's highly biased against to throw in one liners with little explanation just to provoke a reaction does not deserve an ounce of my attention and I try to ignore him. If he wants to be all pro GM, Ford, and Mopar on the respective threads then honestly all the power to him, a lot of us would much rather see that than deal with his persistent trolling ways.
I do agree that we shouldn't ban him just because of his one line opinions, it's just disrespectful to the unwritten code of conduct.