I am a bit confused? This relationship that you are describing...are you in it or not in it? What I have detected over many years about sarcasm is...that it is masking a real 'put down' of some kind. Maybe, to keep people at a distance. I have even noted 'that'...even in my self! It prevents intimacy, if that is what you desire? Ask your self, what is the worse they can happen? The person before you, says...I don't like you, I don't want to date you, I don't want to be with you? You might even end up doing the same thing in certain circumstances! What does it really matter, what the reason is, behind it? We don't have unlimited time, so spending time with anyone that we don't enjoy, is wasting time. And, it can't just work for one person...it needs to work for both people...or the relationship will be lopped-sided! Don't evaluate yourself, by weather a relationship works...we need to evaluate our selves on our actions of caring, patience, and honesty. Not on weather people like us...as we will never please everyone, no matter how hard we try!