You can say "no more" as much as you want. You can point out their foolishness. You can block their content from your life. It's all part of the same dance.
Without some kind of legal exemption, however, you cannot prevent them from saying more (unless you own the platform, but that level of control is limited only to the platform that you own).
Without some kind of legal exemption, however, you cannot prevent them from saying more (unless you own the platform, but that level of control is limited only to the platform that you own).
Such is my understanding.