I love Trina’s for a group of friends! Right outside of Inman sq, great cocktails, friendly bar tenders- cool but not stuffy! They have really good food too if you need some nourishment.
Second State Park- it’s not a dive, but it looks like a Midwest dive and also has great food, a jukebox, and a Photo Booth next to the pinball on the right. I was there a few weeks ago and there was a line around 9- it does get busy!
There’s this cocktail bar on the second floor of a building in central, havent been in years but it was very dark and cool - brick and mortar! I have no idea what it’s like now, but the bartenders used to play vinyl.