No, this isn't true. It's completely normal. It's been normal since long before Twitter. In exactly the same way high school bullying is normal, this is most definitely (a) prevalent, and (b) a problem. But it won't change, because people tolerate it.
You want me to open up my personal projects? It's not going to happen. It won't happen because we live in an ecosystem where the top dog is the one who barks the loudest, not the one who's most productive. People pay attention to what other people say. And there is nothing anyone could say about personal projects except "Pretty cool" or "Damn, what a steaming pile". The first is nice, but I'll get by without it. The second serves only to lower me and my ideas. I don't want my capabilities (ideas) to be constrained by others' lack of imagination.