Well said, @Pizzagirl.
Your issue, OP, isn’t with your friend. It’s with your mom and dad. If your friend gets into great schools, they should be happy for him. Your parents should be focusing on your goals and plans, not worrying about the neighbors.
When they bring him up, tell them that you hope he does get into great schools, but whether or not he actually does has zero to do with you. Your application will be judged on its own merits. What matters is where you’re a competitive applicant and how much they can pay. Ask them how much they can afford per year and get them to run some Net Price Calculators with you. That will let you know what types of colleges to look for (in state publics, colleges that offer guaranteed merit awards, etc.) and give you something to change the focus of the conversation. And I’d change the subject every time they bring him up because discussing his opportunities won’t help you at all.