Do Childish Gambino and Lupe Fiasco have real beef?

Over the summer, Lupe and Gambino had a contentious exchange over Twitter, which Lupe later played off as a joke between the two rappers. However, during an appearance on Power 105.1's The Breakfast Club yesterday, the rapper/actor contradicted Lupe's claim that the beef wasn't real, stating that his only response was a verbatim quote of Chief Keef's infamous tweet aimed at Lupe during their feud a year prior. Gambino further alleged Lupe had been "sneak dissing" the actor because he wasn't a legit street dude, unlike Chief Keef.