Yeah, the silver lining here is that the reason we use plastic for everything (well, the reason beyond "oil stonks go brrrr") is that it doesn't really react to much of anything and is about as inert as a substance can be. And as terrible as it sounds, if there was any massively noticeable interaction between microplastics and our nervous system/bloodstream/neurons/cellular activity/etc we'd probably be dropping dead by the thousands everyday already, barring any future realization that this stuff fucks with our brains like lead exposure.