You can found a company where colleagues occasionally go to the bar together - as long as it is not mandatory, either implicitly or explicitly. But things that are a part of your hiring process are different than things that are optional parts of after-hours socializing. You should not be allowed to require such behavior because we, as a society, have decided that our employment should not be contingent on our lifestyle.

Also: bars are places that people go to socialize while drinking. You are not obliged to drink at a bar, but you are expected to. People who do not drink are likely to feel some social pressure about their decision while in a bar. That is not okay for a job interview. I have friends who do not drink. I consider it rude to ask them out to a bar because then we are going to an establishment that is clearly not for them.