Nope. Glass is not defective. It is common sense actually. If a rock the size of a pinhead hits glass what do you think it will do? It is glass for crying out loud. Sometimes if it is hit hard enough it will shatter. If it is hit with less force it will crack. Sometimes it will hit with a force soft enough it will chip. Once it chips it will crack. This is why we have insurance.
If you try and fight it, you will lose. Subaru will require the dealership to take pictures of the glass, and the damage. The moment they see it, they will deny it wasting your time.