Perhaps this person didn't present thier opinion in the best way. I believe I agree with the sentiment they were possibly trying to convey. You should assume anything you post on the Internet is going to be public.

If you post some pictures of youself getting trashed at club, you should know those pictures have a possibility of resurfacing when you're 40 something and working in a stuffy corporate environment. I doubt I am alone in saying I made the wrong decision because I never saw myself in that sort of workplace. I still might escape it, but it could go either way at this point.

To your point, I believe, there are instances where privacy is absolutely required. I agree with you too. We obviously need some set of unambiguous rules in place at this point.