In "The Ins and Outs of Inns", Luke says that Mia, the owner of the Independance Inn was the only one who could ever call him Lucas. In this episode, Maisy also calls him Lucas. Taylor also called him Lucas in "Ballrooms and Biscotti" right before he starts throwing the candy.
Possible explanation: Luke was furious with Taylor, and the use of "Lucas" could have pushed him all the way. It is possible that Luke meant that Mia was the only one who could call him Lucas and not tick him off.