so he's three weeks sober and suddenly an EXPERT on rehabs and recovery?
let him squawk, you don't have to take it seriously or DO anything with his words. most freshly sober addicts are cranky and fussy - they have to change, they don't get their drug of choice, and now people are telling them what to do! the horror!!! he's a toddler and someone just took his cookie..........
since he chose to go here and made the commitment, there IS no guilt trip he can lay on you. you don't wrap him duct tape, toss him in the trunk and deposit him there against his will.