Well he has the financial power to influence change in the world, so even if he may be someone whose insight you don't find useful, he is someone you should hear out. At least by listening you will have some idea of what he intends to do with his power, and from there you can decide if your actions will aid or not in whatever change Zuck decides to act on. For example, from this post it is clear the VR will be a big component of FBs future. From this you can do what you believe is a better path for VR and use your bit of influence by not providing money to FBs VR efforts (remove all FB VR apps(including Beat Saber), buy from Oculus competitors, etc...)