If you’re not at a safe following distance behind the car in front of you, regardless of why they’re stopping, your driving skills are deficient. Following distances don’t change because it’s a Tesla; you shouldn’t follow closely as a tire blowout or a piece of debris falling into the path of travel of the vehicle in front of you is just as possible. Im sure there are states with more strict statues; they aren’t the majority of states.

Anyone can sue anyone in the US. Take it up with their general counsel.