I've been called a false teacher, damnable heretic, and even son of Satan before, and often over very slight differences in understanding over scriptures. With that said, God is looking for us to learn, and He has a goal in mind. Check it out:

"...to the building up of the body of Christ; until we all attain to the unity of the faith." (Eph 4:12-13)

God wants unity. Before we throw out the "false teacher" line, we should recognize that unity isn't the same thing as uniformity. When we start looking for uniformity, we can become hyper-critical and prideful, looking for any deviation, supposing that we know everything with 100% accuracy. 

Let's build each other up instead of living by the rule, "The nail that sticks out gets the hammer." There's a place for teaching, but a place for learning from our differences, too. "Now the eye is not able to say to the hand, "I have no need of you." Or again the head to the feet, "I have no need of you." (1 Cor 12:21)

—Lucas