Labels have a tendency to turn people off. Personally, I find the term "attachment parenting" overly twee, and I'm glad I read about the principles before I learned the term.
Even though we do/did many things on the "AP" checklist, I would never, ever describe my parenting as "AP" when talking to someone else. First of all, not everyone knows what it means (particularly those without kids), but more importantly, I think it's an annoying, condescending label that implies that anyone who doesn't follow a particular set of rules is somehow not attached (or imperfectly attached) to their child.
Now, there are people who believe exactly that, but I'm not one of them.