Red wine has been touted for some of its health benefits from natural anti-oxidants. Drinking in moderation in diabetes is also typically not an issue. I don't have specific information to share with you regarding red wine interaction and rejection drugs; so, I suggest speaking to your doctor regarding these concerns.
Lastly, there is a slightly higher risk for developing hypoglycemia when drinking alcohol and using insulin treatment. This is another topic that I suggest discussing with your doctor. Common sense approaches that I suggest with alcohol, diabetes, and insulin therapy include consumption of carbohydrates along with alcohol to control risk as well as checking blood sugars frequently.