Root cause?
Jealousy probably. Whilst I'm not musically aware enough to make a good judgement on the quality of the lyrics and sound. The video certainly has a high production quality and features cameo or collaboration from two big stars.
Maybe the rest of the band were caught off guard by it, Jesy stepped away from the band for mental health reasons and a few months later comes out with a reasonable quality first single in her solo career.
It’s not the first time there has been a bitter falling out and feelings of betrayal because someone left a band and was the first to go it alone.
Doesn't make false racism accusations because someone wears braids, wears braids and sings R&B valid though.