Don't Drink Here

There are a few neighborhoods where you can't drink in public. I can walk down the street with a beer to visit my neighbor in South Austin. But if you're in a neighborhood that you see in the pics in East Austin then you can't walk down the street with a beer to visit your neighbor. What's the history that led to the ban? I'm thinking it has something to do with alcohol and drugs. I have not seen signs banning walking down the street with bread or meat cutlets. And most people don't want to deal with intoxicated idiots. Or is it another law targeting poor black and brown people within a racist criminal justice system?