Careful who you apply this towards. In fact we should be asking ourselves every day are we going to be who He says it to?

We can say with certainty that Fred Phelps and anyone who pushes fear or preaches hate in the name of Jesus are likely in that category. But Christ didn't say this to create lines in the sand or to encourage tribalism. We're supposed to challenge ourselves with that phrase.

But again, don't challenge yourself out of fear that you don't have it right. Moreso that you're trying to be Christlike.