Exclusionists would do well to remember the term "there's no such thing as bad publicity". Even posts either with more hateful sentiment than sense raise awareness of a specific group of people existing, thus expanding the number of people exposed to the very ideas and identities they so viciously despise.
Though the inflammatory nature of their digital witch hunts does often leave others with a negative association, all it really takes is a little nuance to begin poking holes in an exclusionist's typically black and white criticisms. (That is, of course, if people actually attempt to think critically and come to their own conclusions rather than blindly following the first thing they hear about a topic, but that's another story.)
Regardless, if the intent really was to erase a certain subset of people they find unacceptable, they're going about it all wrong. Making broadly tagged posts ranting about how awful these people are, creating discourse blogs denouncing and calling out that groups behavior, it's all still awareness. It's much more effective to quietly silence their existence rather than publicly demonize.
Historically, hate groups have used a well calculated mix of both defamation, demoralization, and quiet suppression. Here, it seems exclusionists only focus their efforts on a fraction of this, leaving many more likely to sympathize with the targeted group rather than side with their persecutors. But quietly attacking and censoring them from the sidelines while they can only helplessly watch on? That's much more effective.
After all, everyone loves an underdog, but no one cares about the boy who cried wolf.
I don't say this to advise or condone the ostracisation of others over differing viewpoints. Personally, I feel it's a cowardly and weak-minded reactionary response to the unknown. Rather than adapt and learn, exclusionists assign a moral inferiority or threat to whatever they don't want to face or understand. I'm more pointing out the counterproductive and counterintuitive behavior of exclusionists and their hateful rhetoric found on many social media sites.
There will always be discourse blogs and yapping anti-whatever posts. Block lists and DNI debates, call out posts and anon hate; all because the violence has always been the goal. Nothing more.
Hateful people have always been obnoxiously self-sabotaging in their efforts because their aim isn't truly to erase their target. Otherwise they'd have no one to harass anymore. No, they go to all that effort for the thrill of hurting others. Maybe it really was about morals and the betterment of society at first, maybe they really did think their target of choice is some horrible threat to everyone, but all that vitriol doesn't sustain off a sense of justice alone.
They're in it for the pain of others and hide this under some fabricated sense of justice and moral superiority. Otherwise, perhaps they would've noticed their shit doesn't work years ago.