Yes, those "thugs" started it. Yes, saying they were going to get the "white" kids is racist. Yes, they should have been booted out of the theater.
My point is that the OP took one incident where a group of black kids were truly acting like thugs and racists and extrapolated it to the entire black race. These are HER words:
"I swear, things like this just make me mad and it really burns me up that black people are constantly screaming about racism when the real racism exists within them"
Really? ALL black people are "screaming" about racism? The OP must have talked to every black person in the country in order to know that. Otherwise it's a gross generalization. Otherwise, imho, she just looks silly.
Sorry, she had my attention AND sympathy until I got to the part about "all" black people. From then on it was just another run-of-the-mill, knee-jerk tirade about something that was no doubt upsetting, but certainly not earthshaking. Those kids were jerks, but it's over. You're the fool when you let them get you that upset and they walk away smiling.