Again, where did I say any of that? In order to demand an apology, I'd probably have to use the word, or at least one of its synonyms.

The point I'm making is that if you are actually interested in making any change to society, being caustic towards centrists is counterproductive.

Think about it. If you want major societal change, you will need a majority of the population on your side. Anything less and you'd just be trading one form of authoritarianism for another. Now if you are dividing the population into three groups (left, center, and right), which group do you think you would be drawing people from? Do you think you can convince them to change with verbal abuse? Would that work on you?