husband too negative

Husband is negative most all the time. I have done the manual and know that people have a right to their opinion and they will do what they want to do. It is too much that everything out of his mouth is complaining. Do I set a boundary if I do not want to hear it that day? I am doing love most of the time. What about the times that I am exhausted and need not to hear so much complaining? Please advise. Maybe a model? I do not know where to start making a model on this.