PC,
To be honest, I don't think anyone has ever been thrown out of ASGCA for that clause specifically. But truthfully, some guys have been called on the carpet, had official hearings, etc. and by all accounts, it changed their behavior for the better.
Its often hard to discern exactly what negative things one gca may have said about another. Its not like some young buck goes out and publishes those kinds of things in a book where we can read them in black and white you know!