Glass teapots look fragile, like they’d shatter if you sneeze too hard. But most are made of borosilicate glass, which is tough enough to handle boiling water. You’re not handling antique porcelain from your grandma’s haunted armoire.
Treat it with basic respect—don’t tap it with a spoon like you’re summoning a genie—and it’ll survive. I once dropped a cloth on mine while it was full of hot water. It just bobbed there, unfazed.