Allow me to help you along....there is no true "free speech"...there are rules to everything, including speech. This goes for standing on a street corner, yelling FIRE in a crowded theater, or making a statement that a BOMB would be a great thing to build while you're sitting on a plane...
How many times are you gonna parrot the "fire in a crowded theater" line? Get a clue, Bob... restrictions on speech are permitted in cases like the ones you cite where that speech would lead to panic that would cause imminent physical harm. "Opinions" that could cause "hurt feelings", on the other hand, are exactly the type of statements that
are protected.
Now since Ron is not a government entity and owns the board he can make any rule he wants, and here it really comes down to what he will and won't allow, but you really need to stop trying to make justifications beyond this by misquoting Oliver Wendell Holmes and applying the concept to things it most clearly does not apply to.
Even though you talk a good game and fool a fair number of people by doing so, there's no question in my mind that your IQ is in the double-digit range.