I saw the video of him calmly saying "you are an appalling idiot" twice to a student after the student said what he's doing is disgusting (thrice) [1]. Is there a video of him shouting it?
Of course not. The activist to whom you are replying is using one of his tactics, "lies and distraction" in order to hook people who may not take the time to watch the video.
[1] https://twitter.com/chrisgeidner/status/1634791941350064128