I definitely don't think it's rude to chat. At the same time I did sort of struggle with the chatting thing.
There were four of us on the ward and at first it was great. Everyone was chatty. The staff talked about how lovely our ward was and would come in as much as possible. I was quite frightened going in and initially it did really cheer me up.
The problem was that it soon started to feel really intense, and once we had established that level of constant chat, it was difficult to reign it back in and the ladies would just continue chatting at me undeterred, even if I was being a bit quieter. We even had a new person who arrived who was much quieter and the others were sort of rolling/widening their eyes at her as if she was being stuck up for not being as chatty.
One of the ladies leaned into the "mad old lady with no filter" stereotype and while she was fun at times she was also rude to some of the staff and gave me some unsolicited advice that was quite offensive. Another lady was initially lovely but seemed annoyed that my recovery was going better than hers (we were in for the same thing) and she seemed to direct that at me. She also said something quite racist and the other ladies in the ward agreed with her.
It's just this really intense forced closeness that's weird. There was no privacy when talking to the doctors and talking about your poo in front of everyone in the room was somehow more embarrassing when you'd got to know them a bit. When visitors came, the conversation would open up to the whole room and everyone would join in like the visitors had come to see everyone.
I felt I had to keep my social mask on the whole time and be polite. It was just a bit suffocating and I felt there was no space just to be really unwell.
There's not many people I think most of us could get on with well enough to spend all day every day with. It's the reason living with or going on holiday with friends often goes wrong. It's the reason that when you go to a party with extended family, you can appreciate that Auntie Barbara is a right laugh and does a good 'Dancing Queen' but she's also says some questionable things and at the end of the night you're ready to say goodbye. It's the reason that you don't mind the sweet old man on the bus talking to you for 20 minutes about his grandchild's pet lizard, but you'd not necessarily love the prospect of being stuck on the bus with him for a week.
So no I don't think it's rude for people to chat at all, but it was also one of the oddest experiences I've had and I don't envy people who have to do it frequently.