Lets hear some NAT pet peaves.    Mine are simple and not intended to bad mouth anyone as I am sure I post many things that peave other people and they probably include this post.  

#1 When someone asks the OP a question that is already answered in the OP's post.

#2 When someone complains that the post has been beat to death in previous posts.  Usually there are new people answering for the first time, so you get new info and not everyone can search.  I skip over every post I'm not interested in.  Makes it easy.

#3 When someone asks for you to help them chose between 2 products and they get a pile of replies promoting a 3rd or 4th brand.