Fawy

“The narcissist has to defend himself against his own premonitions, his internal sempiternal trial, his guilt, shame, and anxiety. One of the more efficacious defense mechanisms at his disposal is false modesty.
The narcissist publicly chastises himself for being unworthy, unfit, lacking, not trained and not (formally) schooled, not objective, cognizant of his own shortcomings, and vain. This way, if (or, rather, when) exposed for what he is, he can always say: "But I told you so in the first place, haven't I?" False modesty is, thus, an insurance policy. The narcissist "hedges his bets" by placing a side bet on his own fallibility…
Yet another function is to extract Narcissistic Supply from the listener. By contrasting his own self-deprecation with a brilliant, dazzling display of ingenuity, wit, intellect, knowledge, or beauty, the narcissist aims to secure .. protestation from the listener.”
― Sam Vaknin, Malignant Self-Love: Narcissism Revisited