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Hand him the Shel Silverstein poem about nose picking.

Just hand him a tissue when he does it. No need to shame him. He probably doesn't even realize he's doing it. If you give him a tissue every time he does it, he'll become more conscious of what he's doing, and will correct it on his own.

next time he does it you could offer him a tissue (politely) and see if that snaps him out of it, he might not even notice it anymore.

Going up, my parents were were divorced and never communicated directly. I got bounced back and forth between them a lot. Always based on what my mom needed. Fuck my social life or grades or stability. If being a parent started to get too hard, she'd ship me off to live with my grandmother or father. She'd get lonely,…