In the pic, the 28-year-old can be seen popping a bottle of bubbly (as you do when you're celebrating) and sticking out her tongue with a bit of attitude.
One could assume that she was actually pictured in character as the sassy Haley Dunphy in the snap.
But one of Sarah's Instagram followers definitely didn't see it that way, taking it upon herself to comment "Be a little ladylike in your pictures 😐😂."
Instagram
Turns out, nobody but the OP was laughing.
Sarah didn't take too kindly to the rude demand and quickly shut the user down, replying "NEVER."
And honestly? We can't imagine a more perfect response.
Because firstly, who's to say what constitutes ladylike behaviour and what doesn't?
And secondly, nobody has the right to tell other people how to act — especially when it's not hurting anyone and was clearly a joke.
Sarah's community leapt to her defence, slamming the commenter and even speaking their own truths about being judged online.
Emma NorrisEmma is Deputy Editor at Girlfriend magazine. She's obsessed with being cozy at all times, eating cheese, binge-watching comedy shows and reading Facebook comments about anything and everything.