Alcohol has no negative effects on my colon or UC. I drink beer, wine and liquor while in remission and during mild flares. At social settings it actually relaxes me to the point that I don't worry about urgency. After 2 glasses of wine or two stiff drinks, I can eat hors d’oeuvres and be relaxed and enjoy myself. If it's a long wait before dinner I may have another one before dinner and during if wine is served then. This has worked well for me for parties, holidays, weddings, etc.
My in-laws do after dinner Turkish espresso or Greek coffee and I'm so relaxed by that pointc that I don't have any urgency issues at all.
They sometimes have flavored liquors after all that. The next day I feel great because so much great food is eaten and everything is relaxed and fun
If you don't eat a lot of food with your drinks make sure you drink a lot of water while you're drinking at least.
I stop drinking during a severe flares only because of the dehydration it causes. Over the years I drink less because family things and driving interferes and my UC has not improved.