Things that are None of my Business, a Non-Comprehensive List

1. What other people think of me.

2. Other people's opinions about my decisions.

3. Why other people make the choices they do.

4. Other people's medical status and their decisions about their care, unless it's a matter of Public Health.

5. How much other people weigh, and what they choose to eat.

6. Other people's belief system (or lack thereof).

7. Whether or not other people choose to have children or not, and why.

8. Why other people choose the relationships they do.

9. How much money other people make, and how they choose to spend it.

10. Who other people choose to have an intimate relationship with. 

ETA:

11. How people choose to dress.

12. How people choose to spend their time.