Have you ever known people who when they first met you, were earnest and seemingly sincere in knowing you and upon knowing you and knowing that you do not matter in the grand scheme of things* in their little world would discard you?
I have met a number of these people. Initially, when you meet them, they have not figured out how you could be of consequence, thus, they are wary and they play safe by their friendliness. Within months, they will have figured out the social dynamics in a group and they will stick to the so-called leaders and befriend them.
These people are everywhere now. I met a number over the past year and their true colours only begin to emerge lately. I can't say that I am surprised by the turn of events anymore.
*Essentially a nobody in their eyes.