A lot of people despise and hate LeBron for many reasons, some on the court and off the court...so many do slick sneaky remarks about or towards his family to hurt him.
Even if Bron didn't put it out there pressuring the notion of wanting to play with his son, Bronny would still be under scrutiny and criticism because he's the man's son, it comes with the territory.
Chanting “overrated” had less to do with Bronny but more to do with his father. Don't be surprised when his other son Bryce who is slightly better still gets the same reception when he plays college ball because he will...same thing with Zhuri if Bron and Savannah push her towards women's basketball as she gets older.
All his children to a certain extent are going to have haters, hell even Savannah surprisingly has haters. LeBron is one of those athletes who'll go down in history where the disdain towards him is bigger than basketball.