Once completed, your written material should be as a photograph. Make yourself numb. Care about it, but only as a piece of art to improve. Treat critiquers as people all wishing to help you improve the art. In the long run it's only their opinion.
People have lives of their own.
Even if your group meets every week there will be memory fallout about the different pieces of literature being read. Take into account and look for remarks that come from someone forgetting what came before. It can color the critique, in some cases majorly. Especially if someone forgets the chapter where a character is introduced or any other important event ensues. If you are writing something that makes everybody uncomfortable, I don't care how disciplined the critiquers are, the feedback will be colored.