Sewing Blind : Weaves comments in and out of social networking threads/forums totally missing the 'eye' of the thread. LOL
Has no understanding of what the first statement was about, or doesn't care and posts impertinent (that have nothing to do with the subject) comments.
John is always Sewing Blind, he never quite gets it!
Jane is always Sewing Blind, she should pay attention to what she's reading, she's always making comments that no one can understand.