conversation with a "friend" i kicked out of my house.

[BahamutDF]

You can't reason with an addict. You can't expect them to see a rational viewpoint because they're by definition irrational. Some addicts need help but don't know how to get it and / or are too embarrassed to seek it, others need a very severe wake up call. Sounds like this person is the latter. Not much you can really do but distance yourself.