You use other people’s opinions of you as building materials.
There 
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[asking others] to
Constructively [building]
criticize me. [opinions of you].
So, you are being constructed of opinions.
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Yes, and that’s ALSO a constructive criticism at the same time. So basically I’m’ saying “You should ignore my advice”, which is a bit of a paradox.
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I know 🙂 I was just teasing. I saw a logical paradox hiding there that I could use so I did it. [I just spent 2 hours going through bills and my brain is toast so I needed a little levity]
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It’s a black American expression also adopted by other cultures. It comes from “Preach, brother!” – as in “Gospel” – as in “You speak the Gospel Truth”.
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A lot of American expressions start in black American culture. They create a lot of new English, which I like.
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