It's not a 1:1 comparison is the thing. A DUI implies you can still get into the car and start it, so it's like you're bragging about only doing half the job. You haven't passed out at the bar and your friends stack empties on your head 15 high. (I've seen the Welsh do this at 10am ahead of a WC qualifier that started 10 hours later)
I've seen both of y'all get sloppy, UK and WI/MN. The Brits, but especially the Scots, do drink more that you statistically, and are just better at it.