What would you do?

[catfan]

So I sold a rangefinder on another forum. Quick easy sale or so I thought. When it arrived at the buyers house the box was crushed and a crack in the plastic on the rangefinder. I packed it in shipping popcorn and airbags so assumed it would be fine. When I posted the add I put shipping on me but insurance on the buyer. He never requested insurance. Well the buyer said he’ll keep the rangefinder but wants me to refund half the purchase price. I feel bad it happened but don’t think I should have to refund any cash. What’s everyone’s take on this? Also worried that if I don’t do as he says he’ll give me a negative rating.
Thanks guys