Obsessive-compulsive disorder is an anxiety disorder in which people have unwanted and repeated thoughts, feelings, ideas, sensations (obsessions), or behaviors that make them feel driven to do something (compulsions). In the movie, Mr. Udall has several things he does, routines that he is used to and that he never forgets to do. For example, he locks his door five times every time he comes back home, he also takes a very long time in the shower, and while packing for a trip he lays out all of his things that he is taking with him on the bed, perfectly lined up. Also, he never walks barefoot in his house, he wears these loafers, even when he wakes up he slightly touches the floor with the tip of his toes to check where he put his loafers. He is also very clean. In medicine, comorbidity is either the presence of one or more disorders (or diseases) in addition to a primary disease or disorder, or the effect of such additional disorders or diseases. In the context, I felt that Mr. Udall has Asperger syndrome, where he is unable to show his kind self through anger. He is not able to show other people his true emotions, also I felt that he has an excessive need to be clean, like a germophobe.
OCD causes Mr.Udall to be extremely anti social, seeing as he makes every one in his life hate him because he is so mean, so he is alone and has no friends. I think that Carl, Simon and Frank get really mad at him because they don’t realize he has a problem, they hold it against him and get extremely angry.