Powerful people have long weaponised self-deprecation as a means of letting off steam and blunting more serious attacks. (That theme is elaborated very well in

Powerful people have long weaponised self-deprecation as a means of letting off steam and blunting more serious attacks. (That theme is elaborated very well in the LRB here: https://www.lrb.co.uk/the-paper/v35/n14/jonathan-coe/sinking-giggling-into-the-sea https://www.lrb.co.uk/the-paper/v35/n14/jonathan-coe/sinking....) Michael Bloomberg is actually a great example, in how his campaign relied so heavily on irony and self-deprecation to defuse the (anticipated) discomfort around electing an old white billionaire.