Does it bother you that the same could have been said in defense of the actual Nazi party?

No, because 99% of the time these labels have no basis in reality and those who use these labels don't bother to even try to prove these accusations. They became just fighting words for dehumanization, used without a second thought.

I don't think it could have been said. The Nazis were, from the start, clearly and enthusiastically in favor of violence against their political opponents. Their first attempt at a violent coup happened only a couple years after they were founded.

They didn't go as far as Antifa does but the TEA Party certainly was guilty of many of the same things. Lots of threats to bring "Second amendment solutions" to political disagreements. They certainly engaged in dehumanizing their opponents. Seems like whoever is out of power does this and each cycle it gets ratcheted up another notch. It's worrying what the reaction in some quarters might be if someone like Bernie Sanders, who openly calls himself a Democratic Socialist, wins the presidency.