Being dismissive vs. standing by to what you believe in vs. disagreeing

What do you think of these three? I saw a presentation and the examiner said that the presenter was being "dismissive" after giving comments to the presenter's work. As I see it, the examiner was putting words inside the presenter's mouth and making it seemed that the presenter was just doing a particular task instead of a series of tasks, so how is it the presenter was being dismissive if the presenter disagrees with the examiner regarding the matter? Any opinion?

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