The bad kind of diversity is projecting your ideology onto others, and deciding to like them. The good kind of diversity is attempting to understand what it would be like to think in ways that are alien to you.

To consider current events, let's take Hamas. Hamas is a deeply conservative and radicalized group. They believe in banning abortion, killing gays, killing Jews, and that atheists are evil. This is not slander, they would agree with all of this. And there are good historical reasons why they believe these things.

Suppose that you're LBGTQ+ and aren't a member of a church, and are carrying a sign saying, "Palestine will be free from sea to sea." What are you actually supporting? You're supporting people who are brown and oppressed, who in turn would like to see you dead. Now it may be that in your ideology it is worth this on ethical principles. But most people like that who I've dealt with simply ignore the fact that they are supporting people who believe in banning abortion, killing gays, killing Jews, and that atheists are evil. And then are caught by surprise if they encounter the fact that Hamas believes in banning abortion, killing gays, killing Jews, and that atheists are evil. (And try to forget that they heard it.)

I, personally, like knowing a diverse group of people. And understanding them for who they are. I may disagree with them violently, but I still like trying to understand them. But this requires a very different kind of tolerance than most progressives preach. For a start, you can't start by banning intolerant speech. Because there is no way to express the intolerant views that many people actually have without being willing to listen to (though not agree with) intolerant speech.

Presumably: The bad sort is a diversity where people look different but all think more or less the same, so the proponents can pat themselves on the back for being good and openminded people but don't actually have to deal with genuinely different people. You can see it in how those sorts tend to despise people who look the same as themselves but have different views and how their love of diversity disappears the second the different-looking person doesn't hew to their ideology.

Like San Francisco used to be more diverse, that’s what I’m getting at. People will argue that point, because the word diversity has taken on different meanings. I’d say there is diverse-diversity and less-diverse-diversity. I prefer one thing, other people are more tribal and prefer that other structure. Both types are needed, but I think we could use a bit more diverse-diversity at the moment, to increase dynamism. Mix things up a bit. At least with respect to the internet.