The most you can do to protect him is the same that people do in hostile regimes throughout the ages: make sure that by a certain age he understands that there’s a difference between what’s actually right and wrong and what the powers that be expect him to adhere to. It’s okay to make a stand but only if you’re very sure that the upside is worth the costs. The people blasting anti-feminist content under their real identity, to no personal or societal gain, are idiots.