I think what some people find odd is that it's not odd, LOL.
Basically, if you are a drinker, you think it's odd that you cannot get alcohol in a theme park. To people who do not drink, it is odd that people find it odd that not every place you go serves beer or liquor.
I have a friend who has to deal with this issue constantly, and it's quite amusing. Her husband comes from a "dry" family, and my friend comes from a family where, I kid you not, at a 2 year-old's noontime birthday party, has a case of champagne for the adults. One family thinks that's insane, the other thinks it would be insane not to.
I don't really drink (honestly just never found anything I liked the taste of, it's nothing to do with the effects or any other issue), so I do notice when others have more alcohol-centric views. To people who have those views they would debate "-centric", as in many places it's "normal" - but when alcohol is part of one's daily life, or is missed when not part of a theme park experience, I do notice.
Honestly I personally don't care, as long as there aren't beer carts everywhere (mostly because I find the smell terrible), but I do find it fascinating to see the different perspectives and that some people really do think about/drink every day. It's foreign to me, I guess that's why I find it interesting.