Why is Milk or Chocolate Milk not a good option post workout

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Even just the Dairy alone is not a good thing to have post workout. Milk is packed with natural sugars, proteins and fats. Although the sugar source in milk is Lactose and it doesn't spike blood sugar levels as much as refined sugars. Once you add the chocolate, you add the refined sugars as well. Dairy is an insulin secretagogue, therefor it prompts the pancreas to secrete insulin. A study of type 2 diabetics found that after consuming milk, their insulin response was 5 times greater than expected based on milks carb content.
https://link.springer.com/article/10.1007/BF00873217
The spike in insulin may decrease the rise in glucose but it can leave you more insulin resistant the following day.
So! In my opinion!
No, Chocolate milk post workout is not acceptable.