Anything that shows evidence of omnipresence, endocrine disruption, bioaccumulation, and inter-generational transmission should be extremely, extremely closely scrutinized.
To think otherwise is absolute braindead contrarianism, full-stop.
There is practically nothing that ordinary people can do for prevention, mitigation, diagnosis or treatment of microplastics in our bodies, so I therefore conclude that it is futile and wasteful to worry or argue about it, unless you have abundant free time and resources to get paranoid strangers all in a frenzy, for no good reason.
What about those advocating for smoking bans in shared spaces?
Cholera outbreaks near the city water wells?
Or are microplastics special in some way?
Discover what plastic is harmful and we can't start to talk.
If microplastics are a case of FUD, then there's nothing to look into. How and why would anyone discover anything surrounding a case of moral panic/FUD? By definition, there's nothing to discover.
Like I'm pretty sure the bigger health risk with a plastic soda straw is the soda, not the straw, you know?