We could, but then we should also tax everything else (e.g. glass bottles) based on objective criteria as there is no reason to single out plastic.
Perhaps these criteria could be based on the ease and cost of recycling, with a huge penalty if not recyclable and a bonus if biodegradable/compostable.
Perhaps these criteria could be based on the ease and cost of recycling, with a huge penalty if not recyclable and a bonus if biodegradable/compostable.