Traditionally, men should remove their hats during prayers or hymns, whereas women might choose to keep their decorative hats on. However, this practice can vary greatly depending on the denomination and local customs. Observing other attendees and being aware of the norms can help you navigate this aspect with grace. src
given this wasn’t even a service, but just using the space as a venue, i will say that the hats are the least disgusting thing happening in the image
That would be a different couch from the ones I've ever owned.
Sitting sideways on a couch reading a book is quite comfortable and plenty of people (myself included) don't wear shoes or socks at home, especially in the summer.
Context. I think some etiquette is ok. An overemphasis on it is not. E.g. while you and I don't care about it in our own homes, I wouldn't encourage it where a level of decorum is required, and the oval office is one such place. How would they feel if Lavrov did the same? If they can't respect the office they claim to hold dear, why should others?
99% of "normal etiquette" is just a bunch of outdated rules that make no sense. If even the "return to tradition" crowd is starting to feel comfortable wearing hats to church, it may be a sign that nature is healing.