Borosilicate didn't hold up

So everything I've been told about glass didn't hold water,lol. The borosilicate Erlenmeyer flask I was using shattered when I poured hot water in the tub but the mason jars were fine. What's up with that?

So everything I've been told about glass didn't hold water,lol. The borosilicate Erlenmeyer flask I was using shattered when I poured hot water in the tub but the mason jars were fine. What's up with that?