I only have a second to post, but I dont think that you are making too much out of it at all. Children should not be exposed to that at all. First for the physical and emotional aspect, but it also teaches them less than desirable behavior and can set them up for a lifetime of drinking too.

If your ex truly has a drinking problem and is in denial about it than your probably wont get anywhere with trying to reason with him. Doesnt hurt to try, but it has to be an addicts own decision to change.