You hear this a lot from people in the UK and Ireland, and on holidays abroad the evidence seems plain to see, but over the last few years I've found quite a few countries in Central and Eastern Europe where locals drink a lot more than I'd thought, and not much differently to UK and Ireland. I've not looked into it much but as an example
"Drinkers in the UK get drunk more than any other nation in the world, findings from a global survey suggest.
Britons reported getting drunk an average of 51.1 times in a 12-month period – almost once a week – the report featuring 36 countries found.
On average, respondents said they got drunk 33 times in the last year. This number was 50 times in the US and 48 times in Canada. The rate was much lower in countries such as Chile, where they got drunk 16 times a year."
https://www.google.com/amp/s/amp.th...more-often-than-35-other-nations-survey-finds
The headline is dramatic but drinking 1.1 times a year more often than the average Canadian or American sounds a lot less dramatic. I don't know where, say, Belgium, Czech Republic or Russia fit into that spectrum, but I'd be surprised if its world's apart.
Maybe excessive binge drinking is where the UK really stand out, but I'd be interested to see the evidence for it. I've been in villages in countries where alcohol is prohibited but it's widely known by locals that the one semi pub they have there, all the men go there most nights of the week, get on the lash, get aggressive, rinse and repeat. So I'm a bit more sceptical of the reputation now as things look a bit different under the surface.