There’s this guy I work with, his life goal seems to be to wind me up. Just me out of all the staff, he’s even admitted its just me he does it to. Constantly irritating and annoying, gobby, unreasonable, answering back (I’m slightly senior to him) refusing to do what I tell him to my face so I get annoyed but still does the job anyway? Always in my face making jokes, underlining everything I do. And yet we sometimes go weeks where he’s not like this at all and we get on so so well, close even then suddenly he just flips and goes back to being an annoying little p. What is his problem??