You know, I find it increasingly sad in our society that many things now have negative political undertones that shouldn't be there at all. I could name off a ton of them, but I'm not going to.
As far as drunks go, I don't see a problem with it. Most preteens know what drunk is, but there has to be a cautionary moral to it, I think. Which is why most books make the drunk a comedian fool, because they are all saying 'look, if you drink, you are going to look like a fool' and that is fine. I have not come across a children book that glorifies drinking, but there are a lot of commercials and television shows that do, so you have to make sure that you are not making it something awesome that everyone wants to do.
And some general thoughts about kids books that I have come up with;
Since I have kids, these are the things I really hate in childrens books--
Complicated words. Yes, kids are smart (my kids are geniuses, and perfect) but the more complicated the word, the harder it is for a parent to explain it when reading a bed time story after working a ten hour shift. For example, superfluous--why would that word be in a book for 9-12 year olds? Seriously. Easy to define words. Its ok if they are long words, I don't mind that, but words that are easy to explain!
It also depends on your age group and the type of kid you are writing for.
Now, I would think that most parents wouldn't mind alternative lifestyles. That is fine. But, if you are writing for the under 13 age group, nothing more than hand holding and a light peck on the cheek is appropriate for my kids. No daytime TV type of themes, I don't let my kids watch daytime TV because its full of selfish people, and that's just sad. Most childrens books only have one selfish bad person, who learns how to be a nice person.