He looks so ridiculous to normal people when you just show his statements and quotes to them. This whole article is a lot of quotes, and why talking like that is dangerous and bad.
But i only even heard of this douche when people tried to stop him from talking. Before Berkeley, never heard of him. Because he was just some internet loud mouth.
If you try to quash someone's speech, you give it credibility. People who believe what this guy thinks can now express themselves as his supporters, and thus be argued with and criticized, especially for supporting someone who turns out to be a piece of shit like Milo seems to be. But if you treat them aggressively, or you refuse to address them, then you force them into hiding. They go into their own echo chambers of Facebook and where ever else.
Trump's win is a good example of this. The polls were all wrong, because a lot of people knew better than to say they supported anti-Islam, anti-immigrant policies in public. But those people exist. There are a ton of them. Obama said something really smart in his farewell address. Go talk to people, in person. He didn't say "Shut down people who say vile things."
It's impossible in the first place because I can start a website that's available to literally everyone in the country and say whatever I want to whomever will listen. I can write a book and publish it on my own. I can get linked on reddit and 4chan and distribute every terrible idea I have to people who centralize to hear it.
You can't just call people stupid and evil and expect to change their minds. If your ideas are so great, then you should understand how to make them palatable to others, and show them the flaws in their ideas. It's just lazy otherwise.