If someone gets frantic when you confront them, then they are probably lying no?

Most likely.

Idk, I'm usually frantic in a confrontation if it's complete bs. Like the audacity of some people.

But, if I'm wrong and you can show me that I'm wrong, then Ok, I'll admit it.

My bad. My mistake. Will try not to do it again.

Not necessarily. Are you confronting them on the spot? If not they might be trying to figure out what your talking about

Most probably.
But exceptions do exist.

Nobody likes to be confronted.

Not necessarily. Depends on how you confront them.