It is wrong to refuse to frequent someone because they are poorer than you?

It is wrong to refuse to frequent someone because they are poorer than you?
I personally don't care if someone is richer or poorer than me, but my fiancée made me notice that many of my friends (especially girls) are less wealthier than me and eventually I lent them money or they asked them.
She told me that's a good reason to not associate with those people as they'll always ask me money - I don't really agree with her, but I still have to give it thought.
What about you?
Updates:
7 d
My fiancée and I made some calculation and it turned out that one friends owes me around 200€, another 55, a third one 270 (without counting the groceries I bought her), while my sister and my ex still owe me more than 800€.
She asked me if I'm running a charity or looking to get those money back.

7 d
I don't really care about the money, but I'll still try to get back some of those money from my those people and other people we added to the debt list.
It is wrong to refuse to frequent someone because they are poorer than you?
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