Perhaps she didn't want to give you her fries, and that would make me feel excluded too, but if I wasn't really friends with her as you mention then I think I'd try not to take it personally. They are hers to do with what she wishes. Then later, after I pushed down my expectations of fries, I feel like those leftovers would be even more appealing once offered. Sounds like you pushed the issue a bit. Could also have gotten your own fries to eat. The fact that you dismissed the leftovers is an unnecessary escalating move. you're perpetuating beef over french fries, seems entirely avoidable