It started as beef but I don’t even see how it’s that meaningless at this point tbh. It’s kind of an ignorant “eugh, I don’t like these rappers!!” thing to say.
Kendrick’s often covered meaningful topics in his music, including how his mother was molested and generational trauma in the black community.
So it makes sense that he’s sickened by Drake’s actions, and it’s actually good that someone with a platform is calling him out on it and drawing attention to the topic.