I think you're right, but I do also think there's another level to it as well. When the digital revolution was on the horizon, there was this excitement to it - the ease of access! the democratization! EVERYONE can be a reporter, opinion columnist, writer, etc! Which, to some extent, is true... and we've discovered that maybe it's not such a good thing that all these people get the ego trip of having a platform. So I think you're right, that at one level all the internet has done has been to make public the flaws, the prejudice and ignorance and spite etc., that we had all along.
However, I do think there's still a difference when you make those qualities public. Take a conspiracy theorist. They've always existed. But societies tend to form a sense of norms, and mechanisms to push things to the margins that don't satisfy those norms. Sometimes we complain at the unfairness of it, and sometimes justly (especially if we're the ones being marginalized), but there's also a healthy quality to this dynamic, to keep the unhealthy at bay.
With the mass democratization of information on the internet, however, the mechanism of marginalization breaks down. Before, while the conspiracy theorists existed, they didn't have a platform, most people could go about their lives undisturbed by them, they were marginal and they knew they were marginal. Now, however, they can have an internet forum, a chat group, a facebook club. Instead of a conspiracy theorist being the one oddball in his entire town that wears a tinfoil hat and subscribes to a mimeographed newsletter put out by another tinfoil hat guy who lives a thousand miles away, the tinfoil hat guys can all club up together and rave about their tinfoil hat ideas on a daily basis and commiserate about how nobody else appreciates their secret knowledge. They become a community to themselves. The margin disappears and the center disintegrates. Nobody's sure what's "normal" any more.
Most of us aren't really equipped to rationally analyze every proposition that comes to our doorstep. We rely on social cues, on whether our reference group around us finds an idea or proposal reasonable and good or crazy and bad. The tremendous connectivity and communicability of digital media makes that instinctive reliance go haywire.