No, there are other verses that show how believers are to behave towards others (both believers and not). To apply that verse to everyone does violence to basic hermeneutical principles.
Therefore it would be improper to apply that to any group other than false prophets.
“Actions speak louder than words”, while perhaps biblical in principle is not a biblical text, nor does it work with the context of Matthew 7.
That said, I consider Obama to be a false prophet, so I do not object to Matthew 7 being used in relation to him.