I've been involved in anti-racist/anti-fascist work, either directly or on the periphery, for about ten years at this point. This takes many forms, from street confrontations with fascists, protests at book readings and other events, and also disrupting fascist conferences and similar.
Anti-Racist Action is the organization that has developed the most tactical and strategic influence in this space, not by design, but by chance (and it largely doesn't exist anymore). Disrupting fascist meetings by denying them space by getting hotels to drop them is the bread and butter of any ARA chapter. It's the easiest thing to do, and most modern tumblerites aren't willing to get in the streets with a bandanna and a baseball bat, so it's what gets done now. And in fact, it's likely that this sort of thing happens because ARA activists got involved in more liberal groups, etc., and the tactics just trickled down.
Personally, I have developed political differences with the "SJW" orthodoxy myself (though obviously in the other direction), and have seen the effects of this sort of attack applied on a social level. It has made my own work slightly more difficult, because I have to pick my comrades more carefully to ensure that they won't alienate me from my network. But this isn't a big deal for leftists, because there are already so many camps that are mutually oppositional that you'd need to do that already for some of your politics anyway. What's new in the last few years is having that extend away from your class alignment. (This is an answer to a question you didn't really ask, which is how the "SJW" community itself is affected by this, though it is what came to mind when I asked myself how I felt about it.)
As far as this issue and other similar issues are concerned, I'm overjoyed that, as you put it, a climate of fear exists for fascists, misogynists, racists, and similar. I hope that this continues and only worsens for these people.
I'm happy for many reasons. The first is that it has, as you've said, made privileged people afraid. I think this is only the beginning. Privilege creates safety, and as it is removed, I think the unsafety of the oppressed will in part come to the currently privileged classes. But if I could flip a switch and make every man feel the persistent, gnawing fear that a woman has of men, I would in a heartbeat. I wouldn't even consider whether the consequences were strategic, I would just do it.
I'm also happy that these people are achieving real victories. This is nearly impossible to do in a post-reformist landscape, and so the people involved in getting this fascist kicked out of this conference will have a real victory under their belt where their friends who are campaigning against some law that will inevitably pass or for some reform that will inevitably never happen won't. I hope that these victories can motivate people into taking more action. Burnout is a huge problem in activism and successes stave it off.
I would not say that I set out to defeat a "discourse-stifling" monster. The monsters I set out to defeat were patriarchy, capitalism, and white supremacy. These systems violently oppress, they don't "stifle discourse." In fact, they LOVE discourse! When people are discoursing, they aren't in the streets. I've seen so many promising movements hobbled by reformism that I'm glad the possibility no longer exists, though that isn't at all the fault of SJW-outrage (and is rather a consequence of the fact that the economy is in large part so perilous that nobody can afford the concessions that were previously won by reformists). So if discourse is permanently removed as a tactical and strategic option for future leftists, I'll consider it a victory.
You might be unsurprised to find out that free speech is not valued on the left or among "SJW" groups. I suggest you research this further, because I can't communicate to you in a single hacker news comment why this is, or what theoretical basis it has.