So I'm spending the weekend at my DP's house, we were all up late talking in the kitchen. DP was having a conversation with their DM at the table whilst I was on the sofa on my phone feeling pretty tired. I then got up and went to give DP a goodnight kiss and said I was going to bed. (At 3am)
DP comes to bed 10 minutes later saying that it was rude of me to just come to bed and said that their DM thought so too. DP said that I should be expected to stay up until whatever time they decide to go to bed, as it's 'rude to just take yourself off to bed'.
AIBU to think that I am not being rude and that actually to keep someone up until you're all ready for bed is in itself rude and strange behaviour?