So, next time you are giving a speech, and you find yourself with a more hostile audience than you expected, think about what you can do to turn the situation around. For instance, consider telling a joke at your own expense that might make the environment a little more light-hearted and a little less hostile.
In may seem stupid, but making these minor adaptations can go a long way in making the content of your speech resonate with the audience. If they find you particularly strident, boring, or disconnected, they’re likely to lose interest, even if what you’re presenting is fundamentally good.
Source of Information : Public Speaking Exposed