I've had a huge disagreement with a friend. I want to know how to mentally and/or emotionally destroy them

What if they're right though and you are the one who deserves to be mentally destroyed?

That's already happened.

So you had a disagreement, and you admit you are in the wrong, and that mentally scarred you? Wut

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No fuck that, cripple the fucker.

Like said, find their weaknesses. Leech them off of that, slowly but surely. To really hurt them you have to be consistent. You could do it big and at once but after awhile they'll forget about it. Making it last is where it's at (and if you're going to do it big violence will need to be had).

Tell us OP, what was the disagreement about and what weaknesses do you notice about them?

The disagreement was about them wanting to stay holed up at their mom's while wasting money on sex toys, programs to enhance porn, and them fucking people without even knowing their last name. They've used my address to order sex toys to hide from their mom without my permission. I've put up with their shit for too long.

They are emotionally weak, so I'm sure anything would work. I just can't think of what that would be.

Ah, is it possible you could call/email the places that sent you the sex toys and request a receipt? If you still have the original shipping material you could drop the stuff off when the mom is home without her knowing you gave it. Tie it up in some inconspicuous wrapping so he/she won't know what it is.

You said they were held up at their mom's, and assuming they're well above age to move out she's probably done with their shit. Drop the innocently wrapped packages at the mom's place when she's home (make sure the mom gets them first)

Their mom's fucked up too and she encourages their behavior. She's also very overprotective.

I threw out the receipt because I didn't think much of it at the time, which was about 8 months ago.