I don't think your being silly at all! I think it's better to teach children not to touch things rather than just removing everything they could touch. I'm sure it takes a while to get to the point where they will listen and not touch things, but surely it's worth it, especially say in the shops where they might possibly break something!

And I won't expect people to baby proof their houses either. My baby, my responsibility.

I do sort of agree with cutting your MIL a bit of slack, she probably was a bit scared of a tantrum for saying no, i would be. But still, it's glass! That's a hard one! Sorry i haven't really helped