It is important to remember that just because both Miley Cyrus and Beyonce are women, it does not mean that they are the same person.
Miley is young and at an age where it is normal to party and act crazy (the only difference between her and many others her age is that she is in the limelight).
Beyonce is older, married and a mother.
While they are both expressing their sexuality, they are doing so in a way that is relatable to their age and the stage that they are at in their life. It doesn’t seem out of the ordinary for someone in their early-twenties to be at a house party drinking out of a red solo cup, while someone in their thirties is dressed up and sipping on champagne.
Beyonce and Miley: Classy vs. Trashy 