Stay Peaceful
It is very hard to keep cool when you find yourself in an awkward situation in which something unfair is happening. Some people know how to deal with these situations peacefully and others just get caught in the moment and lose it.
Looking For Trouble
Regardless of your approach, one can never know how the other person is going to react to your comment. They can get up defensively and violently. Would it be worth it to get in a fight just because of a sit?