At the beginning of his speech, what bit of humor jason reynolds charm his audience

Jason Reynolds charmed his audience at the start of his speech at Lesley University Commencement address by making a joke about his hair and the fitting of the head ornament he was using. The central idea of his joke is to validate one of his principles: Insecurities are Healhty.

"Sometimes insecurities and fears can push us towards greatness: to do more and to be more." (Reynolds)

So, the final answer for this question is:

by making a joke about his hair and the fitting of the head ornament he was using.

No that is not true as is displayed by the book 'A modest Proposal'

Explanation:

A modest proposal is one of the most brilliant pieces of satire ever written and presents a very absurd argument.

The point is not to make the people to agree to the argument but to say that what it represents is based in reality and morally abhorrent.

By laying a factual and well argued claim for the fact one actually foes on to claim that the practice should not be done as it is wrong even though its being justified by the text itself

This is the prime point made by the text .