"Shout out to the one you thought were real friends, but really are just fake friends in disguise," Winter tweeted with a GIF of David Spade flipping the bird in the film Dickie Roberts: Former Child Star.
Of course, Winter didn't elaborate on her tweet, but with 2017 right around the corner, the timing seems perfect for a clean slate.
Before exposing the apparent friend drama, the 18-year-old actress put a sexy spin on Christmas. Winter recently Instagrammed snapshots of herself wearing a blonde wig and racy Santa costume, and cozied up to her boyfriend, actor Levi Meaden, in another steamy shot.
When it comes to body confidence, Winter credits her "amazing" sister, Shanelle, with setting a good example.
"She was always that person who felt amazing about herself regardless if she was going out in sandals and socks, or to the grocery store in her pajamas, or if she was going to an event in a ballgown," Winter told ET in October. "She was always there to support me and make sure I felt beautiful and special anywhere I went."