i agree with BBW, sounds like she has seen a glimpse of the REAL you - and doesn't like it.
alcohol lowers our inhibitions and can sometimes let out a part of us we usually keep hidden in polite society.
you have shown your true colours and i expect she has realised you are not the person you pretend to be.
what you did was cruel, pointless, immature, nasty, stupid, irrational, arrogant, cocky, vindictive, spiteful, pathetic and just plain humourless.
i hope you got all the fun out of it as you had hoped.
i am also not entirely convinced you "made it all up for a joke" - why would anyone make life difficult for themselves, when there is no reason?
I suspect you spilt the beans in a bold brazen way and now regret it and are trying to backtrack and want us to provide you with ideas to try convince her it was all a lie.