I'm a bit put out so posting.
I've just been at a meeting over the weekend with some friends - work-related, not social, but still fairly relaxed. Friend A organized it and sorted out places for out-of-town people to stay, except she forgot about me (which is reasonable under the circs, so I don't mind). So she said I could stay on her sofa. We all went out in the evening and various people started going off into little groups. She gave me a key and said I was welcome to come back on my own, but 'not too late - if it's 4am I won't be pleased'.
I assumed she simply meant 'not too late', so when it got to 2am, I texted her to say it was late so I was staying somewhere else, and thanks for the offer.
She's given me a lecture now about how she'd put sheets on the sofa and everything, and I am silly to think it was polite not to come home at 2am. She says she meant 4am literally!
AIBU to think she's a bit strange? She gave me a huge lecture about how it's not necessary to try and be politer than your host has asked you to be, and how she'd rather I just did as she said and didn't try to be polite.