Plastic bottles float. They float far and wide. There are billions of them in the oceans, right now, as we speak. Now imagine a plastic water bottle versus this:
https://www.youtube.com/watch?v=1m9EyXLDlu0
A 15 meter wave breaking in 1-2 meter deep water above an absolutely razor-sharp reef. A plastic water bottle--or really anything at all, will be absolutely obliterated by this. The oceans are full of a microplastic soup that is the ground-up dust from our massive garbage problem. That is now raining back on us. It's not hoodies, dude.
I'd like you to explain how these microplastics are being turned into "dirt". Do you have a specific chemical process in mind? Because I don't. Microplastic is alien to the biosphere. Nothing, short of some lab experiments, nothing processes microplastics. It just gets ground up smaller and smaller and bleached and flaked by UV. It will be around for centuries. It's not biologically inert, either. It's been show to be an endocrine disruptor and kill microorganisms. It hits the bottom of the foodchain. It attracts other pollutants and concentrates them, filling a role as a kind of carrier of poisons that absolutely do kill life of all kinds. It's bad shit.
You have a lot of anger in your comment. It's not neurotic to study carefully what our massive carelessness is doing to this planet. Rather, it is depressing to see how flippant and dismissive some people are because they are uncomfortable seeing the cost our economies are exacting on our home planet.