Spiritual economics suggest that effort given to one thing will detract from effort given to another. Merely the time you've spent arguing with me over "heretics" has taken time that we both should be giving to more important pursuits, so, I bid adieu.
So, in other words, you can't back up your stance that we're not to reprove or rebuke false teachers?
"All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness," 2 Tim 3:16
Even in your use of the Great Commission, you seem to neglect verse 20 of Matthew 28: "...teaching them to observe all that I have commanded you."
How can you teach them to observe Biblical commandments if you're not to make a judgement on what they already know? The Great Commission is, in and of itself, instruction, teaching, reproof, and stern correction to the lost.