No, the reason (in my case) was because the public schools prioritize social agendas over academic quality. My kids can do advanced math. My neighbor's kids estimate or guess. I hope the public schools in my area get de-funded. They are a waste of tax payer money. My choice had nothing to do with who is poor or rich.

No, having a poor kid in the class does not negatively affect your kid. Having a poor performing kids that requires more resources and attention does.