So, my gf and I are together for 1,5 years now.

She just tends to throw something like "dumbie" at me from time to time, she just tends to find it funny, but I just ignore it usually and write it of as just some stupid playful banter.

However, today we had a talk about something which is actually not too important at all. I then sent her a statistic which proved my point and she called me naive for believing in this. You should know that I am working in a job in the MINT field, and I am usually trying to argue only with things that are scientifically proven, so I was really pissed by that. What got me way more was the fact that she called me naive. 

I usually walk through life in a very suspicious way and barely believe what people tell me right away, while she, still living at home, is basically the opposite, and barely ever had to deal with any situations which you might be called naive for falling for something.

So basically, I was super pissed at her at that point. I sent her a voicemail stating that this is just bullshit, and that she really hurt me with saying this to me. I then proceeded to ask her why she was doing this in the first place. She knows that things like these piss me off, and the only winner here would be her ego for some time, while the tradeoff is me being angry at her, so I don't even get the reasoning why you would say this to your partner in a relationship.

She got angry as well, stating that she does not understand the commotion, and when I asked her to just say sorry and we get over with this she mentioned that she doesn't see the problem with me getting hurt, I just shouldn't handle this in such a way and deal with it.

So, AITA for being angry at my gf and getting in a fight for something rather mundane and her calling me naive?