Well it is my understanding that it was a whites-only back in the day. Now it is a not-whites only which really doesn't seem as different to me as you comment indicates it really is. It is just a different group of people telling others what they can and can't do.
If you were white in 60's America, you didn't have to check ahead of time if a given restaurant would serve you food. If you're white now, you still don't have to check.
If you're not white, things are different.
Can you think of some examples of when you were unexpectedly forbidden from participating in an event/group/etc? Did you have access to alternatives?
The 1960s were 50 years ago. You won't experience that today (with very rare exceptions), and that's a good thing. But we can't be forever fixated on things that we've moved past.
1. The purpose was to illustrate the difference between white-only discrimination (the origin of our current discrimination laws) and modern exclusive group events.
2. There are lots of people who lived through the Civil Rights movement alive today, and segregation and the associated attitudes didn't disappear overnight. Do you think 70 year old politicians carry no baggage from their upbringing and early adulthood?