The reaction we should be having to watching Will Wheaton get bullied and harassed out of the fediverse is not "I thought you people would be better!" It's "I thought Mastodon was designed to protect people from exactly this."
Peoples is peoples, and we're going to find ways to be mean to each other no matter how we organize ourselves. Technology can constrain that meanness, or amplify it. Twitter's a megaphone. Can we build Mastodon into a nice set of noise-cancelling headphones?