The homers just want to hear about how good we are and the "negative nancys" just want to be critical. Both are equally bad, but neither should be referred to as "so-called fans."
Just because people are critical does not mean that they aren't still behind them. In fact, one could argue the negative or critical fans are actually more impassioned because they care so much about the team to think of ways to get better, as opposed to "thats great, honey" to everything. We all want this team to do well and we all have the same end goals.