It's not "disallowing discussion", it's "not giving someone a platform." The author isn't saying he wants the person not to be able to say what he's saying, but

It's not "disallowing discussion", it's "not giving someone a platform." The author isn't saying he wants the person not to be able to say what he's saying, but that Twitter shouldn't give him a microphone to spew his vitriol. It certainly can be a positive thing to remove people's megaphones who are not acting in good faith, who are spreading violence and vitriol. There's almost no room for "understanding and exchange of ideas" on twitter, and definitely not what Alex Jones et. al. is seeking from the platform. I also think that one of the biggest issues facing "understanding and exchange of ideas" in general is the idea that no one can be earnest or genuine in their outrage. Your original post used the term "virtue signaling," but even saying that the person is "throwing a tantrum" is purposefully trying to diminish the idea that the OP might be rationally upset about the events that have unfolded.