Are all black people loud and obnoxious? No
Are all loud and obnoxious people black? No
Is it common among black people in some parts of the country to be loud and obnoxious? Yes
Are they doing this to draw attention and proclaim their “blackness”? In my opinion, yes.
My feeling is it probably was not done intentionally, but when a large group gets lit up it very frequently gets loud. The trouble was the defensiveness when they were asked to keep it down.
I cannot go to a movie theater anymore in Memphis. Manner-less in your face rudeness is the reason. Cell phones, texting, talking, and making a general spectacle of themselves is the black experience here. And yes I think they do it on purpose. The culture will not carry out a subdued or quiet conversation.