As someone who has read up on typography specifically to pick better fonts for the worksheets I give to my students (teaching English in a foreign country), Comic Sans is actually a very good font to use. As a handwritten style font, it was designed specifically for legibility. The characters and easy to distinguish and it's actually a good font choice for dyslexic people.

Since the topic of the presentation is in the field of education, I think that Comic Sans (and other similar readable fonts - Comic Neue, Open Dyslexic) is a very appropriate choice. It shows that the presenter is cognizant of getting information across efficiently. And for all those detractors, I'd like to ask them, "Do you ever use Comic Sans (or similar fonts) in your classes? If not, why not?"