I definitely agree that corrections 'under the influence' need to be handled with care but once you are very confident in how your diabetes interacts with your booze, they are a necessary risk. I find if I don't bolus for the carbs in my drink, the result is I get far, far sleepier very early on and end up spending most of the night going to the loo, which completely ruins everything. It really is no fun being out with your friends and really feeling unwell and wanting to go home when it's only 10pm. Also, it murders your A1c. But yes, absolutely, you should NEVER correct for booze at the time if you're not completely sure what you're doing.
Practice makes perfect - because I've been independently managing my diabetes since I was a child, blood sugar management is something that's completely instinctive to me. I've been extremely drunk before but weirdly the bit of my mind that responsibly manages my diabetes has (so far) never been out of control. I can be unable to walk yet still have the presence of mind to test my blood sugar, weigh up the variables and bolus accordingly. Maybe I'm just lucky, or maybe I've just had a lot of practice.
But I would always correct when sober(ish) the next day. Hell hath no fury like a hangover combined with high blood sugar. The longer your blood sugars remain high, the worse the hangover too. I've woken up feeling horrendous the morning after, with BGs in the 12s. That Novorapid goes straight in me.
As I said though, practice makes perfect. I know what booze does to my blood sugars and how it interacts with my insulin so I'm able to weigh up the consequences of what I'm doing. If you're unsure, either don't correct, undercorrect on purpose, or correct properly but then stay awake. And in all cases, test regularly to see what is going on with your blood sugar. Information is power.