He's mad because Casanova did a song with Smoove L who's from Bedstuy and has been doing underhanded shyt to try to sabotage Smoove L, I guess he looks at him as an opp who's blowing up off of the same sound that he brought to the mainstream
But yeah this certainly wont fare well for them and will make it harder for them dealing with promoters and such with the hip hop cops shutting down events and people being scared to book them in the same place and it sucks because they both have the city on fire right now with multiple local hits(Pop Smoke and Smoove L that is, not Trashanova)