I am not sure what is more appropriate, "I'm sorry" or "congrats," but I hope you find healing.
I remember when you called my father a "sperm donor" too, and that's about right. He made his position clear to me when he said, "I don't have to love you just because you came out the end of my penis."
I am sorry for what your sperm donor did to you. It's a tough thing for a man when he didn't get the things he needed from his father when he was growing up.
"The sexual abuse and exploitation of children is one of the most vicious crimes conceivable, a violation of mankind's most basic duty to protect the innocent." ~James T. Walsh