I'm sure that the Forelli's attack you once you enter Staunton Island. Just like the Cartel they automatically attack you from the beginning and the Yardies attack you once you get them their turf at "Livin' of the Night Dreads" (or whatever it's called). And the Diablos DON'T attack you. At least not in my game, they do even run away when I drive-by on them. And they actually pull out pistols once you jump on a car. Never expected it tbh.
And the Sicilians gang cars white Stingers, seen in the last two missions.