Donnie HATED mythic stuff and anything related to magic, he roughly believed science was superior. And you being a witch was a bad mix with him, you being a part of the team drove him mad. He constantly tried to prove science was better than your magic powers and sometimes causing mess ups, it pissed off his brothers a lot but they couldn't really do much about it.

One day as you were sitting at the kitchen table practicing some small spells as you read from your spell book, Donnie walked in and saw. Annoyed as he saw you playing with your magic "Y'know, science will always be superior.." He said annoyedly