The concern is that you keep writing "will not happen" and other responses that are more than just ungentle. The other GM that been mentioned also has a tendency in that direction.
Why if someone gives a suggestion can't you just write something like "thanks for the suggestion but at the moment is that not likely to happen" or "maybe not a suggestion I am too found of and at the moment it is not within the plans and I doubt that it will be as well". Because if someone gives a suggestion they deserve to be treated in a respectful way no matter how stupid the suggestion is.
You have as well noticed last days that what could not happen has happened so calm down a bit with responses even if you got the truth which maybe is the case as well.
And I am not doubting that you and other GMs are making a good and unpaid job to help us make this site even better and we are many that really likes this game.