I could see how he could get annoying - if he keeps not taking no for an answer.

The thing is, I can ship KS/DA in the future, not ruling it out, but for now (I just finished ep 5), he's amazing with his little sis, good with his parents but an utter bastard with anyone else and has been horrible about her great-grandfather's death (seriously, I'd find it hard to move on past him insulting her when she's in mourning, if I were her) and pretty much called her a whore who sleeps with faculty and students. There's not really much to ship there.