I can only point you in the direction of a relatively new captain who, as an FO, was particularly vociferous and forthright on the Forum. Although certain management tried to intimidate him, it would appear that his contributions didn’t hinder his career progression. He is also able to say he stood up and was counted.
In my experience a well thought out and constructive post, which doesn’t resort to primary school insults, can only add to the debate. It may even be helpful to the management in working out the mood of their employees.