Jack Harlow's on top of his game and at the top of the Billboard Hot 100 Chart thanks to his new single “First Class” -- but some fans, critics and industry execs wonder if race is playing a role in his success. The debate came up on Tuesday's episode of TMZ Hip Hop ... as our DJ Hed and Rodney Rikai challenged each other on what's really fueling the Kentucky-born rapper’s rise to the top.