Hmm, first of all, i would rather think Araragi is a perfect chatting friend.
He has his own uniqueness in expressing his own idea and view.
And yes, eventhough he is heavily under verbal abuse by another chara, you cant never defeat him, cause he can bounceback to counter the abuse in his own uniqueness...
"Let's just say, i enjoy in talking with you"
Senjougahara, eps 5...