i have noticed wear on the side of the rear passenger side shock (has rubbed the paint off) 2017 Silverado 2500 with 32,000 miles is this normal?

 

No it is not normal. make visual inspection to see if you can find what is rubbing on it.

 

do you have oversize tires?

 

If the lower body is the part with the paint rubbed and the shock has a cover over the strut then I'd say pretty normal, the cover gets bent a bit and you have paint rubbing off. I know it's happening on at least one of my trucks.