Let me say I am a Brian McKnight fan, but I must admit he is in a weird place right now. First, he recorded an X-rated song about pleasing a woman called "If Ur Ready to Learn".

Well now B. McKnight has recorded an anthem for a porno site . . .  And now he's getting flak from some of his fans...

So this is what he had to say, quote, "Since everyone's so opinionated I'm taking suggestions on what I should do next.  I'm thinking rent a lambo and beat the crap outta my girl… That's acceptable these days."

That was an obvious reference to Chris.  Then he went after R. Kelly, Tweeting, quote, "Or maybe have sex with a 14 year old girl and film it that's acceptable these days."

And here's his jab at Mayweather . . . quote, "Or let the court system let me make 35 million before I do my 87 days in a private cell for domestic abuse that's acceptable these days." (Floyd just turned himself in to do his 87 days on Friday.)

McKnight claimed he wasn't starting beef, he was just, quote, "reminding all of us what we accept on a daily basis . . . and pointing out that in today's society anything goes and WE are all to blame the end."

Chris wasn't buying it, though. He Tweeted, quote, "I see how this works now.  When people's careers get to the 'nobody cares' stage they use my name for publicity!  Lol... "I can't keep helping these old [N-words]. It's a miracle the way I'm bringing the dead alive!"... He also called McKnight's new porno music TRASH.