Automotive safety glass is usually the same in both windshields and side windows, but windshields are laminated together with plastic layers so when a front impact shatters them, they don't shred the people inside.

As I understand it, the force of a (non-fatal) side impact in a car is generally less--reducing the danger of the above--and occupants need a way to escape in case of non-functioning doors, and so glass that can be broken free from the inside is the norm for cars.

That looks like they laminated the side windows. I'm not sure I'd want to be in that even if it didn't have Musk's...musk...all over it.