This is helpful but needs some embellishment IMHO. It's too bald on the face of it.
We can seize upon contempt as a chance to forgive, an heaven-sent opportunity for us to act with the Divine Mercy.
And we can also perhaps regard contempt as an aid to humility.
For instance: most of us will abase ourselves in the privacy of our hearts, cheerfully telling ourselves and God that we are nothing, that we are sinful etc
But to have our pious internal sentiments echoed by strangers in public (possibly using obscenities and violence) is an abrupt encounter with reality.
When I am insulted in public (which happens more often than you might think!) I swear back. And I make rude gestures. I know Christ wouldn't do what I do in those situations. I need to start acting out of mercy and humility, not like a sword-wearing bravo out of Shakespeare.
"This is helpful but needs some embellishment IMHO. It's too bald on the face of it."
Regarding being insulted in public if it chips away at your (my) self love we have to be truly happy because that's a great hindrance in the spiritual life which we are called to advance in. Of course not happy in a perverse sense, because God has been offended, but in the sense that God has used the insulter as an instrument to cause purification on your (my) part.
Of course we don't always have it be silent in the face of insults:
Haydock's Catholic Bible Commentary, 1859 edition.
MT: 5: Ver. 39. Not to resist evil;[6] i.e. not to resist or revenge thyself of him that hath done evil to thee. --- Turn him the other cheek. Let him have also thy cloak. These are to be understood as admonitions to Christians, to forgive every one, and to bear patiently all manner of private injuries. But we must not from hence conclude it unlawful for any one to have recourse to the laws, when a man is injured, and cannot have justice by any other means. (Witham) --- What is here commanded, is a Christian patience under injuries and affronts, and to be willing even to suffer still more, rather than to indulge the desire of revenge; but what is further added does not strictly oblige according to the letter, for neither did Christ, nor St. Paul, turn the other cheek. (St. John xviii. and Acts xxiii.) (Challoner) --- Hence also the Anabaptists infer, that it is not lawful to go to law even for our just rights; and Luther, that Christians ought not to resist the Turks. (Bristow)