This "ban" doesn't actually ban soda, which is why I use the quotes. It's a limit on the amount you can purchase and consume at any one time.
But it isn't even that. You can still buy and consume as much as you want. You just have to buy it in multiple containers, which is wasteful and expensive. And stupid.
As it stands bars can refuse to sell you alcohol if you order too much in too short a time or appear too drunk due to health (and cleaning puke) concerns. How is this different from limiting how much soda you can buy at one time for health concerns?
There are externalities to getting overly drunk in public (from drunk driving to puking on the sidewalk) which
do not apply to how drunk you get in the privacy of your own home. But the only externalities associated with drinking too much soda apply just as much whether it's consumed in public or at home. And you can't regulate home consumption of either soda or alcohol.
Further, what makes this regulation drastically different than any other? Requiring a warning on cigarettes or banning smoking in bars comes to mind.
The equivalent of a warning label on cigarettes would be a warning label on sodas, not a ban on sodas over a certain size. And the ban on smoking in bars is because of the externalities associated with smoking
at that location. Again, there's nothing about public consumption of soda which is any worse than private consumption of soda.
For many people addiction is common and impulse control is poor. It is their own fault, but saying that doesn't solve anything and leaves all the poor consequences for society to deal with. If regulation would result in better health, lower costs to the taxpayer, and still allows people to use and enjoy the product then what's so bad about that?
For starters, it's unlikely that this will have any effect on people with actual compulsive behavior. It's trivial to circumvent, it just costs a bit more. Second, it's intrusive, and that is a bad thing in its own right. The costs of compliance matter, but they aren't going to be calculated, because the city doesn't have to pay them. Third, the particular rules here are complex and arbitrary, with massive loopholes (sweetened latte isn't restricted in size), and certain aspects will likely even backfire (for example, people often add more sugar to drinks they sweeten themselves than is in drinks that come pre-sweetened). Fourth, it assumes a philosophical position about the role of government which I think is stifling and ultimately counter-productive: that the state
should be a nanny taking care of you, and that you should depend upon it to do so.
And fifth (though somewhat related to the previous point): I'm an adult, I can decide for myself what to drink, so **** off, Bloomberg.