As for the other argument going on...I agree with the others that it is in poor taste to continually ask questions that clearly exceed the other person's knowledge base. There's also a major difference in challenging someone on what they believe (and why they believe it) compared to challenging what someone knows about a particular subject when it's clear they won't be able to answer your question. Was it really necessary for you to ask the presenter the same question a second and third time?
It's called being tactful.
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"I address the haters and underestimaters, then ride up on 'em like they escalators"
- Abraham Lincoln
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