I think the fact it’s a whole bottle is a concern if it’s not a rare occurrence - it’s a sign if keeping going until it’s gone. Yes, it’s 750ml but if it were 1litre there’s a chance that someone who wants to or needs to drink whatever’s available, would drink that quantity. It’s the not stopping until it’s all gone that’s the issue.
As earlier posters have said, it counts as a session of binge drinking. The problem is that people don’t see binge drinking as an issue, but think it’s okay if it’s ‘only’ weekly or fortnightly etc.
I guess many people binge drank as young adults…perhaps on an almost nightly basis for a while. This being a cultural norm has led to distorted views. It means older adults think it’s the norm or not an issue to drink a whole bottle of wine on your own fortnightly or weekly…just as long as it’s not every night.
The fact the friend told you about it, suggests it wasn’t a one-off. It might well not be every night, but I’d say that if it is regular and more than once a month, that quantity in one go, is a problem. I know lots of people would disagree. They don’t think they have an alcohol issue and function fine and would say they just enjoy a decent drink at a weekend…but the question is about the quantity of units and also the regularity. Drinking large quantities of wine at the weekend is seen as socially acceptable or even a badge of honour. It’s too much if it’s a large quantity.
Stopping at a couple of small glasses without having a strong desire for more….that’s the question people should ask themselves about.