My problem with this song isn’t that it’s mean to skinny girls, it’s that she equates body value with sexual desirability to cishet men. Also, this woman is pretty skinny herself, so when she campaigns for fat acceptance and body positivity, she’s basically white knighting. She’s also pulling a Lily Allen/Miley Cyrus with her back up dancers, using WOC as human props.
Besides, the song is a weak sauce ear worm. Sir Mix-a-lot “brought booty back” much more effectively before Meghan Trainor was even born.