A quiet room isn’t booing you. Most people are just thinking about their own stuff.

Silence has no content, so your mind supplies some, and under pressure it supplies the worst reading available. What is usually happening in a quiet room is that people are tired, distracted, or thinking about something in their own week. A neutral face is not a review.

When a room goes quiet on you, try treating it as no information rather than bad information. Continue, finish your point, and see what happens. If it helps, remember how little of your own attention you give to whoever is speaking at any moment, and extend that same ordinary distraction to them.