Madonna surprised partygoers at Ultra Music Festival over the weekend when she took the stage to introduce EDM star Avicii. But one of dance music's biggest stars didn't meet her appearance with such excitement.

Deadmau5 took to his Facebook after her cameo to criticize the singer (who just dropped her album MDNA this week) for a joke she made. It was Madonna asking "How many people in this crowd have seen Molly?" that left the producer a bit perturbed as Molly is a thinly veiled reference to the drug MDMA, which is also referenced in the title of Madge's new album.

"Very classy there madonna. 'HUR DUR HAS ANYONE SEEN MOLLY???' such a great message for the young music lovers at ultra. quite the f'n philanthropist. but hey, at least yer HIP AND TRENDY! F---ing cant smack my head hard enough right now," he wrote on his site.

"Seriously, i giveth not a f---ing single F--- for slating on madonna for reaching an entirely NEW level of idiocy ... i can appreciate her meteoric career, and all good deeds done, but WHAT THE F--- WAS THAT? That's your big contribution to EDM? Thats your big message to ultra attendees? Hipster speak for looking for drugs? F--- off you f---ing IDIOT. F---."

Seemingly knowing that his expletive-filled Facebook rant about her appearance would spark debate, he added, "well if this doesnt start a f---in flame war, not sure what will. lol.

"yeah, i really kinda leeeeeeeeroy jenkins'd that s--- huh... MDNA / Molly / MDMA / whatever .. something about a track? still seems the same to me, coz its still, in my opinion, unnecessary promotion of the sh-- that really held EDM down for years."

Deadmau5 received tons of feedback, some agreeing and others siding with Madonna. Hours later, the famed EDM producer wrote a much lengthier post on his Tumblr to clarify what he meant by his comments regarding Madonna's "Molly" statement.

"Im not perfect. i have my vices, and some of them are probably more harmful than a recreational drug or two... but i do know that i am at the very least morally obligated not to blatantly inflict or advocate anything that's detrimental to society, others health, etc," he explained in the post, titled "Responsibility."

"So, if you can be pandered with MDMA references, then at least pander your own ass with a good sense of responsibility which will enable you to make the personal choices that are right for YOU... then i wont have to feel like a f---ing moron on a stage because you paid money to listen to some warm humming sounds high as f---. Besides, one day ill get older, and i dont want a bunch of f---ing irresponsible f---heads on my lawn. RESPONSIBLE f---bags, much preferred... but will still be asked to [get] off my lawn for being a f---bag all the same."

Were Deadmau5' comments out of line, or was Madonna's joke inappropriate? Leave your comment below!