It seems to me that there’s a bigger picture here. The problem isn’t people being snarky — folks have been snarky for a long time, and I don’t see this behavior really disappearing.
The problem is that folks are interacting new ways. There’s a long tradition of not being overtly snarky to presenters in person, but people have not yet learned how to deal with this different way of sharing, where seemingly ephemeral, off-the-cuff remarks are in fact public and last forever (despite that Twitter ‘Delete’ button).
My fervent hope for the Digital Humanities is that it will be able to bring some fresh tools to bear on exactly these kinds of problems with communicating in interesting new ways, while acknowledging the large community of folks who have been grappling with these problems for the last several decades.