Nutpicking is a tactic to make the opposing side seem wrong/crazy.
Step 1: Pick the craziest, most extreme example or person from the opposing side
Step 2: Claim that this example/person represents the entire opposing side. Therefore, the entire enterprise must be crazy!
Of course, an extreme example doesn't represent the entire group - that's why it's an extreme example. But some have a hard time realizing this. If you see the nutpicking tactic being used, probably best to exit the conversation.
There are many more concepts in my "Mind Expander" tool (it's free)