Daehyun did not like Yongguk. Heck, he was not Daehyun's style. So he blamed his friends for making fun of him liking Yongguk, because they know Yongguk is not his taste. It's their fault for igniting the fondness that he did not previously felt towards Yongguk. It's their fault for making him consider a bad boy type. It's their fault that Yongguk acknowledge him and treat him quite different from anybody else.