On being told to shut up

The kind of child to tell you to 'shut up' (or 'f-off' as a matter of fact) is usually a distraught individual struggling to become human and thinking that being rude and fearless of consequences is what being an adult is all about. As far as they're concerned life is seriously shit and they will fight anything they can by all means possible, just in case.
And most of the time, you can see how distraught they get once they realise what they'd just said. Or, at the very least, how upset and worked up they got before saying it.
You still get angry, you shout at them, you give them detentions, but you don't hold grudges and deep inside you just wish you could use a magic wand make them less miserable and less angry at the entire world.
And then there is Kenisha (not a real name). Kenisha thinks you're dirt. Kenisha thinks that all is due to her and if she wants to talk, she will talk, whether you are trying to teach or not has no importance what so ever. And when you say 'Kenisha, could you please stop talking?', Kenisha looks at you as if you were a fly on her sandwich and says 'Shut up'.
Somehow I think Kenisha will follow into her sister's footsteps and get excluded before finishing year 10.
And I know that next time Kenisha sends a door into my face, I am not going to be willing to talk about it and make it go away in hope of establishing a positive relationship with her.
Screw that.