I think it's rude. She choose to be famous and be a public person. She's a role model for most people. If you're a role model, act like one.
If you're ignoring your fans, you will get the payment back.
And I see it this way: She's not famous in Europe YET! If she ever wants to have an international career, she can better act normal.
She's not a Mariah Carey or a Whitney Houston. She should have been honored that people in Italy recognized here. And if she's nice to those fans, her start would have been better (even for a European market).
Don't forget: She has a movie coming up this September?
She lost many fans in Italy right now who are not going to watch that movie (and will boycott more things of her) .
That's a lost chance.
That's how I see it. It's not her personality, it's just not a professional move she made,
Are YOU "professional" all the time or are there times where you just want to be you?
She signed up to be an entertainer. And she has MORE than fulfilled her side of that bargain. BTW the reason that stalkers are called "fans" is because it's short for "fanatic"