Having thick skin is the best way to have a tender heart.

Thin skin (being easy to offend) is conducive to bitterness, pettiness, resentment, impatience, and irritability.

“Good sense makes one slow to anger, and it is his glory to overlook an offense.”
– Proverbs 19:11

“Love is patient and kind… It is not irritable or resentful… Love bears all things… endures all things.”
– 1 Corinthians 13:4,5,7

On the flip side: Love is not “is not arrogant or rude” (13:4, 5).

It doesn’t use thick skin as a pretense for lack of courtesy and coldheartedness.

“Be gentle, and… show perfect courtesy toward all people.” (Titus 3:2)