You can't, says who? Since when does the AMA say what you can or can't fly at anytime in your life? You still under the assumption the AMA has a monopoly on how, when and where someone flies their toy???

The only reason rubber guys join the AMA is for competition. They don't need insurance, they don't need flying fields with safety lines and they don't need frequency boards. And they certainly don't need all of this hypocrisy and animosity. Rubber guys are real artists, not radio control jockeys.

If you're not rubber guy, then what's your concern, again? If they don't want to be part of the AMA, that's their decision, not yours.