I do not make comments about any post except those made by posters who have  indicated that they want me to comment on their posts.  I do this because my opinions are different from most posters, and I don't want to make a post disagreeing with anyone who prefers that I do not comment on their posts.  

To let me know that you want me to post comments about your posts when I disagree with you, all you need to do it disagree with one of my posts.  This will let me know that you want me to disagree with your posts when you say something with which I disagree. 

I do not object at all if you want to frequently disagree with me.  If you ever want me to stop making posts to disagree with you, I will stop.  All you need to do is to tell me that you want me to stop commenting about your posts and that you will stop commenting about my posts.  To be sure that I get your message, it would probably be best for you to e-mail me rather than to post it in a thread where I might not see it.