Sorry to hear that you had a bad experience with the crew. In contrast, I do had the best on united F and C, rather than others. Been on J in CX, LAX-HKG, even pursers didn't greet any F or J passengers at all, just keep chatting with other FA, although she did mention my name for the dinner orders.

Curtains are not allowed to close or they had already taken it off due to security measures. It is good though you only need to share the toliets with C passengers. On CX, since their configuration for 744 had a large part of Y class, it always need to share with Y passengers when you seated in J, they always come to the front, and no FA could stop them from comming.