Part of reducing environmental damage is changing everyone's behaviour, and maybe considering eating in the car not being a good thing for several reasons, one of which is environmental impact.
If you're able to bring your re-usable bag to a store or pay extra for a new one, perhaps you can also bring your own cutlery when you eat on the go or pay extra for some wooden ones?
Even if it was plastic: at least you'd get a chance to say no. Of all the single use food utensils handed over counters, a considerable fraction isn't even wanted by the customer and only accepted because denying would be extra effort for both sides.