If you start flipping out, you'll lose the rest of your audience in a hurry and destroy any credibility you've built up so far. Instead, be polite and move on. I'm sorry, I don't seem to understand how that question is relevant to the process I'm explaining. As the presenter, you're in charge. Try to see your audience as your ally.
Most people get uncomfortable when another audience member is being rude.
If the heckler's barrage continues, peer pressure will likely spark a confrontation. Idea Cafe Inc. Idea Cafe Inc. and all of its current and past sponsors, advertisers, agents, and advisors disclaim all warranties with regard to any information found anywhere on Idea Cafe website, quoted from Idea Cafe or its representatives, sent from Idea Cafe, or for comments published by others on these pages.