It's always existed; you just haven't been around it. It stretches back to the beginning of the Industrial Revolution; read about the Luddites, Blanketeers, and John Henry.

Humans generally don't like having their livelihoods threatened and that's happening more and more as the people who paid others for labor are finding ways to not pay people while simultaneously getting the fruits of labor. It used to just be physical tasks that were simple to automate; now, it's knowledge-based jobs.