Hmmm. Difficult one. I live with one of my exes and we've been best friends for over a decade, since we broke up. I have hated it in the past when partners have tried to tell me what I'm "allowed" to do with him (i.e. no holidays together, no texting every day, etc.). I've broken up with people over it. Some people really are able to be great friends after a relationship.
On the other hand, I've also been cheated on by partners who said they were "just friends" with their exes. And I stupidly believed them, because I'm friends with my ex!
Really, it comes down to trust and boundaries.
If you don't want a boyfriend who gets wasted regularly (regardless of with who), then there's your answer.
If you don't fully trust him to be faithful, then there's your answer.
If you do trust him, but still find it disrespectful (not sure why, though?), and he still wants to do it, there's your answer.
Basically, you need to decide if he's actually the kind of guy you want to be with. From what you've said, he wants to hang out with his ex, he won't have anyone telling him what to do, and he likes to stay out late getting drunk. Can you accept that?