Background: Ms PITA is a co-worker who doesn't pull her weight, tries to dump work on others, excludes me from meetings about projects I'm working on and relays my comments, ideas, etc to my boss instead of giving me a chance to say them myself (actually I think she is taking credit for my ideas). This is all despite my repeated explicit requests that she include me in meetings and let me speak for myself.
So you can see why Ms PITA is no friend of mine. That doesn't stop her from trying to pretend like everything is OK. E.g. by asking me in a gushing over-sweet voice about my weekend, holidays, etc. I respond civilly and politely, but very coolly. I engage with her as little as possible. I can tell she is offended by this and no doubt thinks I am "difficult" or have a "bad attitude".
Does anyone have any insight about why some people can act like total jerks and then expect to have a friendly relationship with you? How could this woman possibly think that I have any interest in talking to her unless it is absolutely necessary? Does she think that a few token nice gestures make up for her laziness, sneakiness and disrespect?
And is it rude for me to be cool towards her, under the circumstances? I can't bear to even look at this woman.