Say, what? There's absolutely no reason to believe that a black hole couldn't "interact" with the Earth.

Sure, we are fairly certain that there are no massive black holes like the one in the center of our galaxy near us. But any star whose mass is over the Chandrasekhar Limit and runs out of hydrogen to burn will become a much smaller black hole, and we could simply run into one of those by happenstance in the next couple of billion years.

Such holes would be hard to observe with gravitational lensing due to their small size, but you would easily detect them when they ate anything due to their characteristic radiation, which I think would come in the form of X-rays, very detectable.