To answer the question,

"Do people who have money in the bank dislike people who haven't?"

If relative wealth or money in the bank is an issue between people it is because one or both have prejudices, fears and/or insecurities regarding their disposition in this matter.

This wonderluster has made friends with people much poorer and much richer than myself.

I have certainly have known or known of rich people disliking the poor and poor people disliking the rich. This is simply prejudicial attitudes.

I can only say what I have experienced in my life.