Red wine is reputed to have health benefits and there is certainly no reason not to drink it 'in moderation' with type 1.
The only info on the lantus prescribing info (and its similar with other insulins) is :
'Alcohol, including beer and wine, may affect the way LANTUS works and affect your blood sugar levels. Talk to your healthcare provider about drinking alcohol'
The main thing to be aware of is that basal insulin is designed to work in the background dealing with the glucose produced by the liver. The liver cannot process alcohol and produce glucose at the same time and it can only process about 1 unit of alcohol an hour. As basal insulin dose is calculated to cover this background of release of glucose, then blood glucose levels can fall. This can occasionally be dangerous. If too much insulin and a lot of alcohol are combined, the liver (being busy with the alcohol) may not release the necessary glucose to deal with very low blood glucose levels.
The way to deal with this is to adjust mealtime insulin with a meal in which unacustomed alcohol is drunk. Not to drink on an empty stomach, eat some carbs when drinking, and not to drink too much. Test levels before going to bed and if you're worried eat something then.
See also:
http://www.aim-digest.com/gateway/pages/diabetes/articles/low bs risk.htm