Batman vs Sherlock Holmes

Nice hat, dork, you look like a duck
 I had Alfred read your books, he told me they suck
 I'll crush your British nuts until they're bangers and mash
 I've seen better detective work in Tango & Cash
 You chump, I kick punks like you off the streets
 While you and Velma here are solving Scooby Doo mysteries
 Nothing makes me laugh, but I bet your raps can
 So bring it on, bitch, I'm Batman!
 I once met a rich fellow who smelled of guano and pain
 Holmes explain
 I deduce this deuce stain as Bruce Wayne
 The billionaire?
 Yes, his wealth would allow this adversary of ours
 To afford the toys his needs
 Since he has no superpowers!
 You want to battle, bat? Bring it then
 I heard he has a British butler
 Good! Then he'll be used to getting served by Englishmen!
 You're a wack vigilante black pantied spud with no skill
 My sidekick's a doctor
 Because his flows are so ill!
 Shut up, nerds, I serve justice, so eat it
 My sidekick only comes around
 When he's needed!
 Boy wonder make you wonder how your ass got killed
 Bite harder than those hounds down in Baskerville
 I'll bust you with that bat-whack-rap repellant
 Rappel a building,snatch a villain then by dinner be chilling
 Gotta secret about your homegirl Irene Adler
 Took her back to my nest, to bam pow kersplat her
 I'll shatter that fiddle with a chop of the hand!
 Holy Conan Doyle, let's get 'em! Aw god damn!
 You're not smart, you're selfish, you endanger everyone's life
 Why don't you let your boyfriend here go home to his wife?
 Nobody likes you, not your brother, not your partner, not Scotland Yard!
 You'll die alone with no friends except that needle in your arm!
 This mustn't register on an emotional level...
 First, exploit childhood tragedy... then gesture with pipe...
 Watson finishes punchline... next, acknowledge compliment
 Conclude with killer catchphrase...
 I believe your parent's homicide is why you mask your face
 You're shamed and traumatized and haunted by the vast disgrace
 Of watching like a passive waste as momma died and daddy was dispatched with haste!
 Holmes, you've cracked the case!
 You're a bat shit crazy basket case!
 Bloody good rhymes!
 I've got tonnes!
 Dissing these dynamic douchebags was elementary, my dear Watson