Fake nice people may exhibit inconsistent behavior. They might be excessively nice when they want something from you, but their demeanor changes when they no longer need your help or support.
Fake nice people often use excessive flattery or compliments to manipulate or win favor. They may shower you with praise that seems insincere or over the top, especially if they want something from you.
Genuine nice people typically show empathy and care for others' feelings. Fake nice people may appear indifferent or dismissive when you're going through a tough time or expressing your emotions.
Pay attention to how much the person talks about themselves. Fake nice people often steer conversations back to themselves, their accomplishments, or their needs.
If you notice that the person has a history of strained or short-lived relationships, it could be a sign that their niceness is a facade.