You wouldn't be asking this question on this forum if it was possible. It wouldn't exist any more as no one would trust Bitcoin any more.
The prime reason it took off in the first place is the way it managed to completely extinguish all doubt about the validity of a transaction. Without that Bitcoin has zero value.
A 'fake' transaction cannot be broadcast, let alone mined and would never reach another wallet nor would it be sendable in the first place. Every aspect of Bitcoin's design squashes the possibility flat.
what about making a transaction that will appear then will never be confirmed
You'll just be ignored completely. It will never appear anywhere.
He obviously doesn't know how the Bitcoin protocol works...