What sovereignty do you have if you are only allowed it? You do not grasp that your freedom to do and say what you want isn't the only sovereignty there is.

If you oppose @heimindanger's actions, you are free to flag him. That retains your and his sovereignty. If you call for banning, or imposition of other institutional mechanisms, you oppose his sovereignty, and prove yours does not exist. Your call for institutional action is a call for actual power to effect your desires, and only issues as a result of your lack of it.