It kind of stands out in memory because I was around 6 or 7 at the time.
Like you, my father had a grocery shop. I remember the sound of the bottles when the shelves were being packed.
An adult always had to open the bottle if I wanted a drink.
When plastic came in, it could be dropped and not break but I remember thinking or feeling even as a child that the glass was better and thought maybe the plastic was just something temporary.

Maybe from the glass it tasted better? My favourite at the time was lemonade and remember clearly the plastic lemonade tasted different, not as good, but maybe the recipe changed as well.
It's too far back to remember for sure, I just remember feeling somehow that it wasn't progress.