I think it depends on the behavior of the person.
I used to quite enjoy getting drunk. It was fun for me! Now, I still enjoy drinking every once in a (great) while, but prefer to stop once I get a nice buzz going.
In all honesty, it has been about 3 years since I have had more than one or two drinks at a time... about 5-6 since I have actually gotten 'drunk'... If I knew I had a chance where I could let loose, not worry about taking care of my DD or anything the next day, and could safely get drunk... chances are my excitement at such a rare opportunity could lead me to make such exclamations. ESPECIALLY if I had been having a stressful time lately, and could use the chance to let loose.
I know plenty of people who act like idiots even without too much liquor.
So, if someone announces that they want to get drunk, I just assume they want to have a good time and that is one of their ways of doing so.
Now, if they showed up with kids in tow and planned to get stupid drunk in front of them, was getting sloppy all over the place, or happened to be a violent drunk... then I may have a few thoughts based on those actions.
But simply saying, "I want to get drunk"... doesn't even rate a bump on my negative behavior scale.