1. They come from more conservative cultures. It's not quite as common for them to show direct interest in a man. Therefore, their idea of "flirting" in such cases is teasing, which can lead to hurling insults, throwing tantrums and just generally being out of control.What is it about Asians and EU's that you think makes them act like this?
2. Asian women in particular tend to be coddled and spoiled by Asian men and so this type of behavior is never checked. Not in the courtship process, anyway.
3. Third, as these two groups of women age, they become more desperate so their "flirting" can take on a strange intensity, which combined with point 1 can lead to batsh-t crazy.