First, everyone wears synthetics, not just in SF.
Second, less plastic is less plastic.
For the record, I also use a metal water bottle.
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.
I wonder if it is going to be more like lead where at the time it was thought to be benignish and as the evidence mounted it was clear just how destructive it was.
All synthetic, all imbued with who knows what kind of chemicals. Then add all the Patagonia & the The North Faces that everyone is hip with...
It's gross and people should do something about it, but it is a neurotic worry rather than a real problem. Most accounts (including this one) even have the temerity to try to link plastic bottles to it (which, also gross, are not a problem as far as plastic fibers in the environment goes) because it freaks people out; so they buy a metal drinking container they shove in their plastic hoodies, which will eventually become a few pounds of environmental plastic fiber pollution.