Forums and online communication relies strictly on words. If you are looking for a network or to feel a sense of belonging, forums are the absolute worst place you could look. Even here, a forum centered around a small interest group, most people are looking for some type of fulfillment. I think the expectations and disappointments we feel when engaging in online communication serve as a direct mirror onto what it is we want.
I come here when I'm bored to see if there is an interesting post. In real life, it's hard to be able to say what I mean because everyone is busy, and moves so quickly. When typing, I can think about what I am saying at my own pace, and the worst someone can do is ignore it. I don't seek connections online, just the freedom to be able to listen and respond without the overwhelming fear that I'm not saying to right thing quickly enough.
It's cathartic for me. However, it is also important to recognize that, most of the time, people respond online with what they already think. I accept that, because I am interested to learn about what a sample of random people think, and why. Any unnecessary bigotry is on them.
If you're upset with an experience online, do not first blame the platform or the individual users. You can't change people when you don't know them. Instead, use the experience as a mirror to learn about yourself. After all, sometimes the anonymity of being online makes us act and respond in ways that can surprise us.