Being able to laugh at yourself removes weapons from unnecessary critics.

Mockery works by finding something you are protecting. If you have already noticed your own absurdity and are comfortable with it, there is nothing left to expose, and the attempt lands on nothing. Self-seriousness is what gives a critic somewhere to aim.

Practice being the first to say the obvious funny thing about yourself. Not self-deprecation as a habit of apology, just an easy acknowledgment. It takes most of the charge out of what other people might say and makes you noticeably harder to unsettle.