I think you are misunderstanding the point. The NLRA grants you the right to discuss your wages with your co-workers. Companies are not allowed to prohibit this, and more people should be made aware of their rights under the NLRA.
Now if you feel that the other employee is being under compensated, and you are getting too much, then that may work out. Or, it may be better to work somewhere else that has more money to spend on employee salaries. But the point still stands, that just because something is legal for you to do doesn't make it a good idea to exercise your rights in every situation.
Companies not complying with labor laws should be avoided, for your own protection.
It's that simple.