Yeah pla will snap if bent in extremis, but it's not brittle.
If you hit it with a hammer it'll usually dent.

Part of that is how a 3d printer build things. a solid skin with a honeycombed interior will resist shattering as it disrupts the transfer of shockwaves.
A totally solid item will have a much greater inclination to shatter as it will permit the transmission of shockwaves through the whole item.