I want to flip off my ex gf instead of wishing her a merry Christmas
But it's the holidays! Why don't you want to wish your a merry Christmas?
You can't expect me to wish my ex gf merry Christmas
This sounds like an odd situation. It is not good to flip off people when you are in a relationship.
You are being too judgemental
I don't know the true relationship between you and your ex, but wouldn't you think it's better to be in the spirit of the holidays and be kind to them one last time as a good memory between you two, instead of giving them the birdie?