You are one public forum. People can disagree with your messages just as you can disagree with others. If you don't want pushback write a blog and disable comments.
There is a difference between "nobody should be allowed to disagree with me" and "it's regrettable that most people hold what I consider to be very regressive positions on this topic." I don't think anyone is expressing the former.
Surely I can critique the collective behaviour of a particular public forum without excluding myself from it? Different fora differ drastically in behaviour, after all.