Kendrick doesn't just hate Drake as a person. He hates the very idea of Drake.
Hip-Hop is rooted in revolution. In defiance. These are the songs of an oppressed group of people, and decades upon decades people have hated it. Accused of being meaningless and invalid. Media outlets took steps to belittle hip-hop and make sure it isn't recognized as an art form and as a means to fight back.
2Pac spoke of wealth disparity and inequality. Tupac was literally a member of a communist organization when he was younger and never stopped speaking against capitalism.
Lauryn Hill spoke of the struggles a woman faces. Not just women, but black women. Salt-N-Peppa. Queen Latifah. MISSY FUCKING ELLIOT.
N.W.A made sure people knew about police brutality and violence against the Black community.
And now, in this day and age, we're also experiencing an explosion of Queer Hip-Hop. Lil Nas X is at the forefront of this. Lil Uzi Vert came out as non-binary and uses they/them pronouns, even when they knew that a lot of their fans would never use it or even respect them for it. Auntie Diaries, a song about a young man who grew up in a transphobic environment and bought into those beliefs, but could never fully do it because his Uncle loved him so much and taught him a lot of life lessons, and that wisdom translated to him accepting his cousin as a woman as well.
He's the perfect representation of what people think hip-hop is. Flexing. Posturing. Objectifying women. A fucker so insecure he bought 2Pac's ring just to feel like he's part of the black community. Rejected by Rihanna publicly. Tried to groom Millie Bobby Brown. Kissed and inappropriately touched an underage girl during his concert. His songs have inspired so many young boys to treat girls like shit. His belief that the amount of rings and chains and cars he has is the true meaning of success.