It's comments like this that made me get a boob job at 22, suffer with breast implant illness a couple of years later, and get into a further £7k in debt having them removed.
All women's bodies are different! Some breasts are naturally "saggy" - mine were never perky, even at 14 years old. Some breasts start from further down the body. Some breasts are very different sizes. We can't all have perfect size Cs.
I hope you do some introspection and grow to realise how fucked up that comment was (especially if you are a woman yourself!!). Judge someone's actions - not their bodies.