Of course you have to know what to improve. If you don't know, ask around - not for vague reassurances, but for specific points that could be better.
Speaking too softly? Speaking too fast? Not enough enthusiasm? Not enough animation? Not enough eye contact?
I'm not talking about normal questions from an interested questioner, I'm talking about loaded questions and interjections, conveying emotions like concern, or apprehension, or anger.
It can come to you in two ways, often both together.
Emotion conveyed by tone. For example, imagine an audience member saying, "This is exactly what we did last time." Or "You mean three times a day?" Tone could make those words neutral, or they could load them with frustration or annoyance.
Emotion conveyed by words. For example, "My team will be annoyed about this." Or "The clients are going to be wary." Or "I'm sceptical about the changes." The emotional words are annoyed, wary, and sceptical
However the emotion comes at you, you can't help but feel it. The challenge is to respond well. But first...