Having the right to say something doesn't exclude my right to say something that happens to respond to what you said. It doesn't mean that I disagree with your right to say what you said but instead that I disagree with what you said. If you don't want to debate your statement then don't say anything more. I'm not going to force my response to you, but nor am I going to withhold it. If you don't want to hear my response then by all means ask me to leave you alone, disable comments, or just outright block me.