Why can't you be nice to a white girl without having her think you want her?

I've noticed this with white girls and that's why I don't like them or even talk to them (I am black). I am not attracted to them what so ever and whenever I was nice to one, they acted like “Oh yeah, you want me. So I am not even nice to them anymore!! An example, this one girl in my Geology cl is one of those white chicks that think they are irresistible to anything with a . She flirts with black guys (I’ve been told) and one day I noticed that she was following me after cl (walking behind me when she usually walked the other way. I ignored her and walked away and the next cl she sat next to me. She asked “Hey, do you know when our final is?” when we hadn’t even had our first midterm. “I said “I don’t know, it should be on the syllabus!” She looked at me and said “I don’t have a syllabus!” I looked at her like “Okay, what the f%$# am I supposed to do about it.” She then said “This cl is just such a pain!” and I just looked away and didn’t respond. Now whenever I see her, she gives me a dirty look. I could care less; I don’t want to ociate with white girls anyway. I figure she probably was expecting me to see her and “notice” and gawk over her and try to flirt with her. But I didn’t and I hit her ego and she got pissed. I've overheard her bragging that one night she went to a bar and “like three different guys bought her drinks!” She has a boyfriend at another school I’ve heard too. So my theory is that white girls do this feed their egos and they are insecure so they need to “reinforce” the fact that they are hot s#$% (or so they think). Go ahead and say that “All races of girls act like that” or whatever but I know many beautiful non white girls and NONE of them act like this. You know 98.5% of the girls who act like this are white.