To spot a Narcissist, watch out for Red Flags.
Mirroring is Red Flag #5, on Narcissist Support YouTube channel‘s list. I would tend to list it as Red Flag #1, because Narcissist are always Mirroring those that they interact with.
Mirroring is a Major Psychological Manipulation Technique and is consistently used by Narcissist, because Mirroring is so effective,
Narcissists have trained themselves to automatically start using it, so as to gain an advantage over those whom they are interacting with.
Mirroring is a Major Red Flag. Watch for it. When you spot that Mirroring is being used, you “Neutralize” a Major Psychological Manipulation Technique used by Narcissists.