Do you agree with the fact that some employers have rules/guidelines that involve your personal life?

I hope you understand the question. It was hard for me to put my thoughts into words just then

For example: You interview for a job at a company. The interviewer informs you that the employees (including you) are not allowed to be drunk in public and things of that nature.
How do you feel about that?

(I’m watching the Real World and the company the roommates work for has a “no drinking in public” rule)