system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why don't popular rappers diss each other anymore?
gpt
Hip-hop has gradually drifted away from the hardcore, gangsta driven style that was widely popular during the 1990s and early 2000s. During those eras, rap was a lot tougher and there was a heavier emphasis on being 'real' -- staying true to street culture, or at least being truthful in your lyrics. Because of that, hip-hop feuds had a tendency to unravel into violence. Artists' had a responsibility to prove that they were as true to their image as possible so as not to be exposed as a fake. During that climate, being exposed meant that sales would slump and your career could be ended. 

However, listeners gravitated away from that culture as alternative and "middle-class rap" -- popularized by guys like Kanye West, Outkast, Kid Cudi, and Drake -- became a mainstream staying power. The climate changed, and thus so did the industry. There isn't an incentive to being as tough as possible nowadays. Yes, there's sub-styles like Trap and Chicago Drill that embody the 90s culture of hip-hop, and violence sadly does still occur, but the regular hip-hop listener got sick of the elements of that era. 

It should be noted that the stereotypical "DAE 90s underground hip-hop" backpacker is not typically wholly conscious of everything that happened during the Golden-Age, and just aimlessly points at present-day mainstream hip-hop as the culprit to every problem in society: money, drugs, sex, etc.