When using the phrase "social setting," the choice of article depends on whether you are referring to a specific instance, a general concept, or social environments as a whole. Proper Article Usage

The unwritten norms and beliefs that influence how people behave in a specific group. Common Examples of Social Settings Social Setting - an overview | ScienceDirect Topics

Schools, workplaces, homes, or public spaces.

Example: "The group met at the library; social setting made it hard to focus on work." Definition and Context

Example: "He excels in like parties and networking events."

Use no article when speaking about these environments in the plural and general sense. This refers to the category of places or situations rather than one specific instance.