So he's a shitty listener. Hmmm...
He's not. He's lying. He heard every word. You can see see his discomfort as he listens to a question. He's thinking "how do I answer this without getting into an argument with a crazy-person?"
Scheer chose to use the question as a way to criticize Trudeau's social investments, while ignoring the conspiracy elements entirely. I think that's the path of least resistance in a situation like that.
All three leaders have had awkward moments at townhall meetings.
Trudeau had the encounter with the rambling girl who went on and on... he interrupted her with the "peoplekind" quip, which became well-publicized. People used it as a way of claiming that Trudeau is politically-correct to the point of absurdity. But in fact Trudeau made a joke to interrupt a rambling speaker and regain control of the situation so he could respond to her and move on to a more coherent question.
And of course Jagmeet Singh had the encounter with the crazy-lady at his townhall who went on a rant about Sharia and the Muslim Brotherhood. He handled that situation very effectively.
And Scheer.. I think he tried to deal with a conspiracy kook in as low-key a way as possible. I think his handling of that situation was ok, but his response afterward-- "I didn't hear the question"-- is seriously weak. A better explanation as to why he didn't confront the conspiracy theorist would have been "I didn't want to acknowledge the conspiracy theory or give it any more publicity by responding to those claims, which are completely ridiculous."
-k