“Who are you to judge? God knows my heart.”

Yes. Yes He does:

“The heart is deceitful above all things, and desperately wicked.” (Jer 17:9)

Which is why, in fact, we ARE to judge …

But righteously. (Jn 7:24)

Which means wisely applying God’s external standards of what’s true, right and real …

To internally justified lies, immorality and deception.