I think the sponsor has work to do on himslef, seems he's looking for someone to point blame on, maybe he feels guilty, but for whatever reasons, remember the problem lies with in him, well both of them individually.
I know very few sponsors that would even allow someone whod just gotten high stay at their home for that reason.
For a minute I was afraid his sponsor might be an old friend whose a sponsor in taht area. I respect his clean time and his work in NA, but not his relationship skills