Pretty clear that his thoughts are if you don't offer a GMs name you don't have a right to an opinion.
The entire exchange was based on the thought that no one should have an opinion without a solution which is absurd.
What's clear is you keep going back to what you think he meant, and I keep going back to what he actually said. I never saw him say "you don't have a right to an opinion", it sounded to me like he just didn't want to hear your opinion - not that you dont have a right to one, but you can make of it whatever you want.