90% of rap beefs are over stupid shit, unless a nigga fucks your wife or robs/tries to kill you (Big/Pac, 50/Ja, Jeezy/Gucci), and even those beefs are mostly speculation
Like the BDP/Juice crew beef. KRS misconstrued a Shan lyric and went nuts on a whole crew. LL is known for this too (Bis battle), and Jay is starting to get like that, even though he doesn't have the guts to go at anyone face to face. Pretty much anyone who's old and thinks they should be worshipped. I could put out a 10 sec video now saying fuck Busy Bee, or whoever, and theyll wanna dust off their mic and SP1200 and go in on me. And the old school fans will rally behind them, even though they haven't done shit in years (KRS vs Nelly)
Oh, and every 50 beef ever outside of Ja Rule.