Come on man you saw the lyrics yourself... the word is literally on every single line. When at a concert you're hyped up, probably on something (alchohol or another drug), and you're just really there to have fun.
Do people reasonably expect to be like this at a very fast song:
"Man down
Where you from, [wait I can't say the word coming up, they'll crucify me] nigga?"
"Fuck who you know, where you from, my [wait I can't say the word coming up, they'll crucify me] nigga?"
"Where your grandma stay, huh, my [wait I can't say the word coming up, they'll crucify me] nigga?"
"This m.A.A.d city I run, my [wait I can't say the word coming up, they'll crucify me] nigga"