Is this a reference to UMP45 getting more votes than M4 during Valentine's day?
Poor M4 though
Damian0358 said:
Based on the other tweet they did, it appears M4 got rejected by the Commander after she had presented him handmade chocolate.
Seems like that's the story for the Twitter version though the Pixiv one expanded on it by adding two more pics before this scene. (Or maybe the art is recycled for another story).
Pixiv has her reacting badly to people's comments on her appearance in the anime.