I read a lot of blogs, and I have a long "friends list" on Livejournal. Sometimes I click through to read comments, and it's always apparent when people are accustomed to a chorus of agreement. I don't especially enjoy entering a lions' den to challenge the accepted truths, so I keep my comments inside my head, or come here to write about my thoughts.
Some people have made it quite clear that unless I had supportive comments, I was not welcome on their blog or Livejournal. Okay, it's their space, I will respect that request. Sometimes I can't handle the stress and work of disagreement either.
Still, I value disagreement. I think it is an important tool in getting to know other people as individuals, and in remembering to respect them. Sometimes I learn from my disagreement with another. Sometimes I even change my mind about things because I went to the effort of exploring a disagreement.