Do you think it is okay that I'm annoyed with my mum and her boyfriend for drinking my graduation whiskey?
Why did your mum and her boyfriend get your graduation whiskey?
They came into my room and drank it. I've been waiting for a long time to drink that.
It's not right of them to do that. It was yours, for a special occasion and it's not okay to take that from you. It would be nice of you to share it with them, but it would have to be your choice.
I can't share something with them if they took it my room.
I agree with you. They were wrong to do this and you have every right to be frustrated.