Is he 12? What adult writes like that? Even in texts? Wow. He is acting like his mom told him he can't go to a party. And I am sure you are the one person in the states who decides when Father's Day is, and did it on purpose to mess up his "boys night"...lol. Sorry, he sounds like a petulant child.
Feel pity for him.
Don't take anything he says to you personally, what he writes is his to own. Don't let it take up that head space of yours. It's not worth it. Have a great day with your girls. Make cookies, see a movie, have a picnic. His life is black and if he would rather be hungover than hang with his kids, well, no offense, kind of really immature.