I'm going to digress from everyone else's opinion. I think it depends on the circumstances and the social circle.
In my younger days, we went to house parties and alot of people got drunk. It was almost expected.
Today, depending on who I am with will dictate the amount of alcohol. I don't take offence if someone comes to my house and gets drunk. As long as they don't do anything to destroy my home, I have no problem with it.
I would never go to Great Aunt Tilley's 99th birthday party and get sloshed, but if my husband and I are invited to someone's house party, I wouldn't think less of people if they got plastered so long as they don't make a total fool of themselves.
I know this has been debated here and on the other board, where many people assume if one gets drunk, they are an alcoholic. That is just not the case. At least, in my opinion it isn't.
I very much agree that it depends on the situation and the people involved, and i also agree that being over 25 has nothing to do with anything.
After the Eagles v. Saints game at our friends' house a few weeks ago everyone there got pretty drunk. We even invented a new shot game, and all were over 25. A very good time was had by all as we drank away our disappointment at our team losing. Had they won we'd surely all have done the same thing in celebration.
The difference there then from Auntie V's situation, though, was that it was all of us, not just one person playing the drunken fool, and it was the host who broke out the shot glasses. I think that makes a lot of difference.
Like sparksals, i wouldn't personally have a huge problem with it unless things were getting broken or someone was causing trouble because of their drunkenness. By the same token, though, if the host does have a problem with it there is no reason they should feel obligated to invite that person back into their home. It's one of the nice things about having your own place, IMO, and not at all rude.