Why are people who constantly complain allowed to do so, when the people who don't aren't ever allowed to?

We all know how "depressed" and suicidal" all these many people with "horrible," "God-awful," "worse-than-everyone-else's" are. But what of those of us that are optimistic, complain about life maybe once per year, hear them out, and try to fix all these problems. Then, when it bubbles up, and we need to vent, all we get is "hypocrite!" I mean, everyone needs a vent, so why is it that those who complain about everything get the comfort of those with usually equal problems, whom stay quiet about them, and when they finally need a vent, they are persecuted?