Its a non issue. Cars get keyed all the time. Just because a Tesla gets keyed or some guy gives someone a thumbs down doesn't mean it's because it's a "liberal car" or a "rich car". How someone can consider the only non-union made American car "liberal" is beyond me. No bumper sticker is going to protect your car from ignorance. Being respectful to other drivers, pedestrians, cyclists, and parking correctly is what will save you from getting keyed by anyone that is open to influence.