There is a piece of information that may be missing from this whole story, which might make it less of a bad thing.
I know that sometimes my kids get into trash-talking with their close friends, and if viewed from the outside, it might look like they hate each other.
What if Tre is actually a friend of the family, and was just being trash-talking? And what if Willow and Bristol where then just trash-talking him back? Sure, they still have the problem of curse words and the fact that it isn’t really private, and Bristol still has apologized, but maybe they weren’t really going after the kid for having an opinion.
OK, on the other hand, Willow did explicitly say that she didn’t know who it was, so maybe that’s not such a good theory.
And for the record, my kids don’t trash-talk their friends this way, and when anything like this happens in my presence, I tell all the kids to shut it down (and yes, I hang out a lot with the teen friends of my kids, playing video games with the boys, participating occasionally in discussions, and I drive them to theme parks and stuff, so I try to be very active and in touch with my kids lives.)