“Send your kid to a school where nobody has money. Then all will be treated equally.”
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It is a father’s obligation to teach his son Torah. Maybe it will make more sense, if only rich people will send their sons to school. Today more and more families choosing to use home schooling system for their kids (not only observant families and not only Jewish families). It is cheaper, and less stressful ( for parents and for children). I don’t believe, that child, who don’t like (I don’t say “hate”) his rebbi, will be a good student any way. The rebbi will have a smaller class, less stress and more patience – everyone in a class will be rich.