Well, SiO2 is pretty different from plastic, chemically speaking. And I would expect that we inhale several grams of fine sand dust per week too.

In other words, the amount of "glass" entering your body because you drank a beer is probably irrelevant compared to e.g. Sahara dust (if you're in Europe) in the air around you.

Plenty, same with pollen; the difference is that glass / silica is pretty inert, whereas microplastics release chemicals that according to some research mimic that of hormones. It's one theory behind humans' fertility declining - not just that they have less children, but they produce less sperm and the like.