Still better than a metal one during MRI scanning.

No, its not. Many small glass shards inside the body will literally kill you.

I think that we compare here just heavy anal bleeding with having part(or parts) of you body ripped apart by metal object exiting it in wrong direction with high force and speed.

The only situation when glass is worse is when metal object leaves your body in the same way as it entered even with higher speed and force, thus not dealing much of a damage.

Hey! I'm here for the ass bleeding from glass - now where TF is it, dammit?!?!?

Ah, this meme is so relatable... to people who attend operas... with dildos... made of glass...

Might just be you.