Won't Leave UFC For Less Than $50 Mil

If 50 Cent wants to steal Khabib Numagomedov from UFC to Bellator -- it's gonna take A LOT more than his "disrespectful" $2 million offer ... so says Khabib's manager.

We spoke with Ali Abdelaziz at a Professional Fighter's League event in Long Beach over the weekend -- and he started off by BLASTING Conor McGregor as a "bitch" and a quitter.

Remember, Conor publicly accused Ali of having some sort of connection to the Sept. 11th terror attacks ... allegations Ali has scoffed at.

"I'll slap the shit out of Conor," Ali told us ... "F**k Conor McGregor. Conor's a bitch. He quit in the fight. You cannot tell me Conor McGregor is a man. He is nothing."

As for 50 Cent, the rapper is now is business…