The only place where they *might* respond is Twitter. You should also send a message online to customer service using AA's webform, as there is a slight possibility that they would throw some miles your way due to the inoperable entertainment system.
AA FAs on international flights are completely rogue, in my opinion. They can do whatever they want with no repercussions whatsoever. AA might respond stating that they spoke to a manager, but as far as I can tell they are powerless also.