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Are you higher status than her in some way? Like in terms of money, looks, education, or something else? It could be that she is insecure and is needing to demonstrate some power over you. Maybe you just have a more wilful personality and she feels a bit controlled? It could be anything really. Or she could just be a selfish person or not have any manners. There's a problem somewhere so even if you correct her behaviour in this case it's just going to manifest itself in other ways unless you get to the root.
Anyway to answer your question I don't think you over-reacted. You had a problem and you brought it up right away, that's the best way I think. I would drop it for now though, she reacted in a stubborn way (typical). But next time a similar situation presents itself, before she does anything wrong, maybe you should make a little joke referring to this incident, in a non confrontational way. This will let her know that these things are important to you, but also that you're calm and willing to forgive her little fuck ups.
Her and I are of similar status, both with degrees, 25, attractive, and currently pursuing further education. From the beginning of our relationship and before we even started dating I have always been the one that "cared less" if that makes sense. There have been two times where I have flat out left her house and once ended a date early because she began to "act up", so she knows I am not one to put up with her when she acts like a teenager or out of line. My family is of a higher status I suppose and she has been exposed to it while making some comments about feeling of a lesser status. She has stated that she has to better herself "for me". It could be just a vibe I give her, but I immediately tried to address her insecurities about status by telling her I don't care(which is the truth) and telling her one of the reasons I like her is because she is always trying to better herself(career wise, looks wise, personality wise, etc.) so all she has to do is continue being her.
I really like your suggestion in the second paragraph. Whenever the situation is a first, I always give her the benefit of the doubt because she doesn't know what I am expecting or like. A real problem will occur when these behaviors become repetitive. What I have done in the past where a problem will arise is address it immediately causing a little argument, and then make light of it the next chance the situation will come up again. This has been extremely successful with her as I have never had the same "problem" twice with her.
Thanks again for the advice!