Yes when you recruit Vivienne and ask Cullen if there is anything you should know he mentions that he got used to mages hating him on principle because he was a templar and he found her opinions on the matter to be rather traditional. A heart icon shows up here which has the quizzing saying she never hated him because he was a templar. He gets a little blushy and says thank you. This only shows up if you play a mage. And the dialog sometimes takes a while to trigger.
I've played a mage and romanced Cullen on each time. Whenever I had that dialogue from Cullen I never got the wheel to pop up and offer me to respond. Same with Cullen's Sera's comment, which I am not even sure there is one.
I'm on the Xbox One, maybe its a bug?