Yes microplastics are absolutely in everything we consume, especially processed pre-packed foods. I listened to a neurology podcast that said every adult human alive right now has enough microplastics in their body to be equivalent to a plastic spoon.
So, avoid microwaving food in plastic tupperware and avoid plastics where you can, but you would spend a fortune and drive yourself crazy trying to avoid microplastics entirely. You would have to limit yourself to fresh and whole foods only pretty much. Or grow your own foods.