It ain't ALL hate for Fergie after that bizarre national anthem at the NBA All Star Game -- with Mariah Carey dishing out some advice on deal with the negativity.
A glammed up Mariah was leaving Sweet Chick on Fairfax Sunday evening -- when she gave Fergie one very simple tip.
By the way, Mariah has some experience in this department ... the haters came out in force for her New Year's Eve performance a while back -- but it didn't seem to faze her.
Aside from Mariah, Offset from Migos and NBA star Karl-Anthony Towns also had Fergie's back.