The only reason to keep secrets is if they aren't free. Otherwise the secret protects nothing. Freedom is broad and self contradictory. Complete freedom for more than one person is impossible.
That's not true. There are any number of subgroups that view certain behavior with distaste that other subgroups do not. Just because there is social and cultural pressure to do or not do things doesn't mean you are unfree. You are just as free to observe the behaviors or not as other people are to judge you by them.
I mean, I don't like tipping. I think it's horrible in many aspects, not the least of which how it taps directly into racial and gender prejudices monetarily (black waiters make less in tips regardless of service level). That said, I tip. I would rather not be known as the guy that doesn't tip (and wages assume tips as of now, so it's a bit unfair to the service people). I'm still free to tip or not, and others are free to judge or misjudge me for it if I do.