Brake discs rust

Hello, I had my summer tires put on today at atu and then let another spring check take part. Result: – rear brake pads. not so unusual after 50,000 But!: what surprised him: the rear brake discs would be due. They would be slightly rusty. He also asked if I brake so often. Another, who heard it by chance, meant that it could not be, and did look at it. He also meant that this should not be after 50,000 km. When I meant that I still had factory warranty, he said: “Yes, of course!” So, what do you think about it?? I suppose that Honda factory wants to get rid of me right away when I arrive at it. The second point is that my driver’s seat is squeaking on the inside. I also read here in the forum that there is even a Honda-internal circular letter, which is what this is about and what to do. Can I also insist on the guarantee here? My dealer has thus convinced me that I don’t even have a typical problem.