Robert

Robert Cohn is a loser. That much is obvious. Mike is right when he calls Cohn out-- no one wants him around. But part of me respects Robert. Loserish as he may be, he still commands some respect. His values would be very respected anywhere but with Brett, Mike, Jake, and Bill. Defending his lady would be very appropriate if she actually was his lady, and was actually offended. I feel bad for Cohn, since he seems stuck on a group of people whose morals are extremely low, and whose respect for people different than themselves is minimal. Of course, this is his own fault, but I'll forget about that for now, attributing it to his general cluelessness.
The moment in which Robert really does gain my respect is when he fights Romero. The fight in itself is a very stupid thing to do. Again, I'd be okay with it if Brett really was his lady, but in the given situation, Robert is extremely misguided in his plan to make Brett become "clean". What makes me respect him is when he refuses to hurt Romero any more, and offers to help. To me, that is a really big thing to do. Sadly, part of me thinks that he only stopped fighting because he was too wishywashy to continue, not because he thought it was the right thing to do. I think that this wishywashiness governs a lot of Robert's life, a regrettable situation for him to be in.
I wish that Robert had not just left Spain without any true goodbyes, because I think that those goodbyes would have been very interesting. I also wish that we were able to see his last conversation with Brett. However, I realize that leaving quietly is a fitting end for such a character.
Overall, I think that there are two things that hold Cohn back from being well liked. First, who he hangs out with. If he had been with any respectable people, I feel that Robert would ha ve been more well-liked. Also, the man just needs to be more assertive! The difference between Cohn and every other guy in the novel is how assertive they are, and he is the clear loser when compared with Jake, Mike, and Bill.