2019 Blazer RS

I purchased my RS Blazer in October and it has a little over 7,000 miles on it. I have noticed ware to the paint behind each rear door and on the lower portion of the door. I drive all blacktop road with no fresh stone etc... . The dealership looked at the pictures I sent and said it was road grim. I personally feel there are to few miles for this and the roads I drive to have this much noticeable paint ware. The door is very smooth to the touch even though you can seen a white speck in the paint. The plastic that runs above the tire is rough as if the paint is being rubbed off. I put the mud flaps on the car with a few weeks after purchase and that was the suggestion the dealership had for me at this point. They said the vehicle is so new that they have no feed back on them to know if it is an issue. One of my concerns is that if it does become an issue do I need the documentation that I made them aware of it and if I pay for it to get fixed that it won't happen again. I am concerned that the damage my continue and the car is still new. I was curious as to what I should do next and if anyone else is noticing any issues. If anyone has any suggestions or issues please share so I may take the next step to get the issue resolved. I love my car but would like to have this issue resolved. Looking for Answers! Danyelle