1) Male approval
2) Dismissal of other women
It is saying: "love yourself primarily because men love you, and dismiss women who are not like you because the female gender is one best judged on looks".
"Yeah, my momma she told me don't worry about your sizeMeghan Trainor - All About That Bass Lyrics | MetroLyrics
She says, boys they like a little more booty to hold at night
You know I won't be no stick-figure, silicone Barbie doll,
So, if that's what's you're into
Then go ahead and move along"