Shampoo came in glass bottles up until the 1970s. And in those days you showered in an enamel-covered iron tub. Dropping a glass bottle in there could be problem, I suppose. But, although I grew up in a family of 11, I have no remembrance of such a disaster ever occurring in our house.
I remember the glass bottles of White Rain - and I don’t recall ever breaking one, either. Maybe we were unconsciously more careful ;-)
I still don’t like salad dressing in plastic bottles; it just seems....wrong.
-JT