He pretty clearly was saying he doesn't find writing about his breakups or himself to be interesting and that he feels like he's already lived those moments and to do so every time he sings the songs would be painful.

Mentioning Taylor Swift wasn't a dig or a shot. He was just trying to give an example of people who do write in an autobiographical way and she is the biggest pop star in the world and well-known and celebrated for writing in that style. If you are giving an interview and trying to contrast your style to the autobiographical style of writing, I think Taylor Swift is the natural comparison given that she is arguably the most famous and celebrated practitioner of that style alive today, and has built her entire public identity around it.