Those "crappy" people prove the point the op you quoted was making, people in other instances ARE hyper sensitive to critiques of western capitalism, that's just an easily observable fact, and it's not rude or out of order to point it out

People in this instance including me are more than willing to engage in good faith with those curious about our politics, but there will be no toleration of bigotry or blind faith in a vicious ideology that is cooking the earth

If we're defedrated because of those principles, so be it