Keep private things private.

The world doesn't need to know your sexual quirks, or your bank balance, and you shouldn't feel the need to broadcast it.

People I interact with know I have a wife, they don't need to know her favorite lube or position. That is crude and unnecessary, and a society that expects that knowledge and welcomes it with open arms has a major root issue.

In the world where information easily gathered I don't even need to hide these thing. If you know my favorite lube then whatever, I would know yours or other people too. These things would not be taboo or strange.

Or further,

Good fences make good neighbors.

It's not because I dislike my neighbors, I just like being able to not look at them and enjoy my home in privacy.

I really don't understand the statement of more secrets than someone needs.

I bet your own mind isn't an open book, you have desires and wants, knowledge, aspirations, and things that belong solely to you. This isn't to be looked down upon, everything shouldn't be an open book for the world to read and judge upon and they should belong to you. That isn't unhealthy, it doesn't mark a lack of moral character, it's your own internal conversation, and frankly, more people need to learn how to work within themselves instead of making everything an open book for everyone else to judge and comment on like they are the Kardashians.

He isn't describing capitalism. Capitalism may exist loosely at a local level, but on the national level it doesn't exist anymore.