I am not a big drinker, but when I go to parties or hang out with friends before we go to parties, I have to admit I do drink sometimes. I am not on a pump so I take insulin when I think I need it after I eat or drink.
Now there have been many articles about drinking and diabetes. Here are my views about it. People say alcohol will take you down, but it depends on what you drink. Don't expect to think that alcohol will always take you down. liquor, rum and mixed drinks will take you up more than down. So I do take insulin, but the way I do it, is that I guess what the drink actually has, and take 1 less unit of insulin for what I think it is. This is to make sure that I do not get low. I would much rather be on the high side and than the low side because I can feel that I am high in my sugar levels. Usually sweaty hands or cracking your bones a lot are signs of being high. (And if you are good at beer pong, missing many shots is a good sign of being high hehe) Feeling low is more dangerous because there are not lot of resources to help you with getting back up (lots of drunk people won't understand you), and drinking more mixed drinks is not a good idea.
Also, if you take lantus at night, be careful with it because alcohol will take your blood sugar down overnight too. Thats when alcohol does take you down the most in my opinion. Take less lantus or take it in the morning instead. That is the way I do it.
Moderate your drinks and never get drunk and you will be fine. That is the number 2 rule. Reason I say rule number 2 because rule number 1 is to not drink at all. That is the best rule for diabetics. But it is hard to follow that for some people.
I hope this helps. This is the way I do it. It is not going to work with every diabetic out there, but thats the best solution I can come up with.