Why am I thicker skinned now that I’m older?

When I was younger, I’d be so easily hurt and affected so much by other people’s negative opinions of me. Now, one day recently I had an epiphany, that not only was I not affected by other people’s negative opinions, so long as I hadn’t wronged anyone, but I started to also realise that some people in general (not all); are bad people and don’t deserve my respect.

Why am I thicker skinned now that I’m older?
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